There are two pairs of antennæ (Plate II, Fig. 2), the first pair being four-jointed, the last joint rather broad and armed with many hairs along the outer margin. The other joints have a few hairs on the articulating margin. The flagellum rises from the fourth joint, behind the fifth and has fourteen joints, each one armed with several hairs on the outer margin of the articulation. The second antennæ are slightly larger than the first and made up of three joints with a brush of plume hairs at the caudal end of the second joint. The flagellum is fourteen jointed. The mandible has a two-jointed palp (Fig. 3), with numerous hairs along the outer margin. The second maxilla also has a palp extending back under the carapace with the function of keeping the carapace free from foreign bodies. The thoracic feet (Fig. 3) are about 1.5 mm. in length, eight in number and biramous. The outer margins are heavily covered with hair, while the inner margins are comparatively smooth. The first four abdominal appendages (Figs. 5, 6) are much larger than the thoracic feet, being 2.5 mm. in length, and are used for swimming, like those of the copepods. They are also biramous, the back margin and tip having numerous hairs along the edge, while the inner margins are lined with many plumous hairs. The first appendage (Fig. 5) is somewhat heavier than the fourth (Fig 6), but the hairs and spines are arranged in the same relative position. The fifth appendage (Fig. 7) is two-jointed uniramous and small, .9 mm. long. The sixth is one jointed and smaller yet. The eight abdominal segments taper off in size and the last bears a pair of caudal styles (Fig. 8) which are lined with sharp spines along their outer margins. The ends of the styles are armed with two long, sharp spines. (_Contribution from the Zoological Laboratory of Pomona College._) EXPLANATION OF PLATE I Magnification 25 Times Figure 1. _Nebalia bipes_. EXPLANATION OF PLATE II Magnification 25 Times Figure 2. Antennæ. Figure 3. Mandibular palp. Figure 4. Thoracic appendage. Figure 5. First abdominal appendage. Figure 6. Fourth abdominal appendage. Figure 7. Fifth abdominal appendage. Figure 8. Caudal styles. [Illustration: Plate I, Figure 1] [Illustration: Plate II] Starfish of Laguna Beach The following is a fairly complete list of shore forms of starfish at Laguna. All but the last one mentioned were photographed by Miss Clency at Laguna Beach. _Linckia columbiæ_ Gray. Fig. 1 A large number of these were collected under stones and in tide pools near shore. A number were found with six arms, and often the arms were very irregularly developed. The power of regeneration is very marked, as may be determined from the appearance of even a small number of individuals. _Orthasterias gonolena_ Verrill. Fig. 2