KEPORT ON THE ANOMURA. 37 



biramous lamellar appendages, the ultimate of large size, its length exceeding the 

 breadth. Thoracic sterna linear, not forming a shield. External maxillipedes moderately- 

 broad, suboperculiform. Eyes not provided with distinct orbits, the corneae of small 

 size. Antennules strongly developed, without special fossae, one of the flagella greatly 

 elongated, the other of moderate size or absent. Antennae with a massive peduncle 

 composed of four or five joints, with or without a movable acicle ; the flagellum 

 i3hort. Males destitute of copulatory organs and with only a single pair of abdominal 

 appendages (on the penultimate segment). 



Of this small though distinct group the collection contains but four species, all of 

 which have been previously described ; two, however, belong to rare and little-known 

 forms. The Hippidea inhabit the shallow water of tropical and subtropical seas ; many 

 of the species (if not all) burrow in sand. In some respects they bear a superficial 

 resemblance to the Raninidea, but have apparently undergone slighter modification ; the 

 presence of lamellar appendages on the penultimate abdominal segment, and of an 

 antennal acicle — essentially Macruran characters — stamps them as of more primitive 

 type. 



Family I. H i p p i D ^. 



Hijipidai, Dana, U.S. Explor. Exped., vol. xiv., Crust., part ii p. 1429, 1852 (jiari). 

 „ Stimpson, Proc. Acad. Nat. Sci. Philad., p. 67, 1858. 

 „ Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. p. .316, 1877. 



First pair of legs non-chelate, subcylindrical. Terminal segment of abdomen 

 elongated, lanceolate. External maxillipedes suboperculiform, the merus broad ; exognath 

 absent. 



Genus Remipes, Latreille. 



Remipes, Latreille, Gen. Crust, et Insect., p. 45, 1806. 



Milne-Edwards, Hist. Nat. des Crust, t. ii. p. 204, 1837. 

 „ Stimpson, Proc. Acad. Nat. Sci. Philad., p. 67, 1858. 

 „ Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. p. 316, 1877. 



Carapace ovate, the fronto-orbital border sinuous. Ocular peduncles slender. 

 Antennular peduncle moderately stout, one of the flagella strongly developed. Second 

 joint of the antennal peduncle of large size, with a slight external prolongation ; the 

 flagellum short. External maxillipedes with the merus dilated, the ischium rudimentary, 

 and the dactylus unguiculate. Last thoracic segment free. Terminal abdominal 

 segment lanceolate, exceeding the remainder of the abdomen in length. Female with 

 three pairs of abdominal appendages in addition to the penultimate pair. 



