174 A HISTORY OF EECENT CEUSTACEA 



work on the Decapod Crustacea of the Black Sea. The 

 book, which is more in Latin than in Russian, contains a 

 wealth of bibliographical information. 



Legion 5. — Galatheinea. 



The carapace is elongate, the regions well defined and 

 usually rugose, with a prominent and acute rostrum. The 

 eyes are placed in very incomplete orbits, the eye-stalks 

 short and stout. The first antennae are exposed. The 

 peduncle of the second antennae is directed forward and 

 generally has the second and third joints coalesced ; the 

 flagellum is long and slender. The third maxillipeds are 

 subpediform, with the third and fourth joints narrow and 

 often spinous within. The chelipeds and walking-legs are 

 often elongate and slender ; the last pair of legs are feeble 

 and inflexed. The sterna of the trunk are broad. The 

 pleon is broad and well developed, simply bent, or folded 

 on itself, never adpressed to the trunk. In the female the 

 second to the fifth segments have each a pair of simple and 

 slender ovigerous appendages, those of the second and 

 fourth sometimes rudimentary. In the male the pair of 

 accessory genital appendages of the first segment are well 

 developed, rudimentary, or absent ; those on the second 

 segment are well developed; the short, usually flattened 

 pair of appendages on each of the next three segments, 

 are well developed or rudimentary. In one genus the male 

 is destitute of appendages on the first five segments. In 

 both sexes the appendages of the sixth segment and the 

 telson form a swimming fan that is usually powerful. The 

 number of branchiae, so far as is known, is generally four- 

 teen pairs in this and the preceding legion. There is only 

 one family. 



The proximity which is now accorded to the three 

 legions, the Pagurinea, Porcellaninea, and Galatheinea, in 

 spite of external unlikeness, is confirmed, as M. Jules 

 Bonnier observes, in a very interesting indirect manner by 

 the circumstance that Bopyrids of the same genus Pleuro- 

 crypta occur in all three. 



