170 A HISTORY OF RECENT CRUSTACEA 



sinidas. In the family he only places, besides Pylocheles, 

 Pomatocheles, Miers, 1879, and a new genus Gheiroplatea, 

 and, as he states that it includes all those paguriform 

 Anomura that are trichobranchiate, he was evidently un- 

 aware that the family Parapaguridse had been already 

 established by Smith for this very purpose. His Gheiro- 

 platea cenohita (see Plate X.) from the Pacific is no doubt a 

 remarkable animal, having among other singular charac- 

 ters a chelate extremity to the third maxillipeds. The 

 single specimen is a female with very large but not very 

 numerous ova. Mr. Bate compares it with GlaucotJwe, 

 Milne-Edwards, which Miers and Bate agree in regarding 

 as only an adolescent form. Considering Gheiroplatea in 

 its adult condition as representing a link between Genobita 

 and the trichobranchiate Macrura, Mr. Bate remarks that 

 ' it has an appearance strongly suggestive of its being allied 

 to a Pagurus that had failed to obtain a molluscous shell 

 for itself, and had consequently retained some of the ma- 

 crurous characters of its youthful condition.' Both Pylo- 

 cheles and Gheiroplatea recall the earliest post-larval forms 

 observed in the Paguridse. 



Legion 4. — Porcellaninea. 



The carapace is well developed, broadly ovate, smooth, 

 with the regions faintly defined. The eye-stalks are short 

 and stout, the eyes always pigmented and partially con- 

 cealed in orbits. The first antenna are concealed. In the 

 second antennae the peduncle is directed backwards, its 

 second and third segments are coalesced, the flagellum is 

 long and slender. The third maxillipeds have the third 

 joint broad, the fourth provided with a prominent internal 

 lobe. The chelipeds are broad and often flattened, the first 

 three pairs of walking-legs well developed, the last pair 

 slender and inflexed. The pleon is symmetrical, bent under 

 the trunk, having on the sixth segment a pair of lamellar 

 appendages which with the telson form a swimming fan ; 

 also in the male it has a pair of genital appendages on the 

 second segment, and in the female a pair of uniramous 



