Most of the true Crabs (Brachyura) have a larval history similar to that just described, and pass through zoëa and megalopa stages which differ only in details from those of _Carcinus_. The Anomura are also hatched as zoëæ, and one of the most remarkable forms common in tow-nettings in British waters is the zoëa of the little Porcelain Crabs (_Porcellana_--Fig. 26). In this larva the carapace has two long spines behind, and a rostral spine which is several times as long as the body of the animal. A great development of spines also characterizes the larva of _Munida_ (Fig. 27). [Illustration: FIG. 27--FIRST LARVAL STAGE OF _Munida rugosa_ (SEE PLATE VI.). × 10. (After Sars.)] The larval form of the Common Lobster has already been described, and it will be noticed that the differences from the adult are much less than in the case of the Crab. From the fact that this larva has swimming exopodites on its legs, like the adult Mysidacea and Euphausiacea (formerly grouped together as "Schizopoda"), it is said to be in the "schizopod stage." The larva of the Norway Lobster (_Nephrops norvegicus_) is essentially of the same type, but the great development of the spines on the abdomen and of the forked telson gives it a striking appearance. A very remarkable type of larva is found among the Spiny Lobsters and their allies (Scyllaridea). This larva, known by the name of _phyllosoma_ (Fig. 28), is very broad, thin, and leaf-like, and quite transparent, so that some of the larger kinds were formerly known as "Glass Crabs." The thin oval carapace does not cover the whole of the thoracic region, which is disc-shaped, with four pairs of long slender legs, each with an exopodite. The abdomen is relatively small. The intermediate stages between the phyllosoma and the adult are still very imperfectly known. In tropical seas phyllosoma larvæ of large size are found, sometimes reaching two or three inches in length. The larva of the Common Spiny Lobster (_Palinurus vulgaris_), however, does not exceed half an inch in length. [Illustration: FIG. 28--THE PHYLLOSOMA LARVA OF THE COMMON SPINY LOBSTER (_Palinurus vulgaris_--SEE PLATE V.). MUCH ENLARGED. (After J. T. Cunningham.)]