ISOrODA. 39 



less easy to understand in an evidently young specimen, such as that in the present 

 collection. Probably, therefore, the peculiar setae are not stumps due to attrition, 

 but an inchoate stage of the undulating fringes noticed above. It will be observed 

 that the spines of the first gnathopod are not blunted, and the finger clearly shows a 

 delicate serration of the inner margin and small setules on the outer. In the adult 

 male the serration is less easy to observe, the finger having become thicker and coarser. 



Length 6 millims., breadth 3 millims. 



Locality: Coast of Ceylon, under 100 fathoms. 



Cilicaea whiteleggei, n. sp. Plate IX. (A), (B). 



Male. This species is easily distinguished from C. latreUlii by its much slighter 

 general structure, as well as by the character of the very elongate dorsal process in 

 the front division of the pleon, the terminal part of which is not conical but almost 

 parallel-sided and sharply bifid at the apex. Also, the apical notch of the telsonic 

 segment is simply semicircular without median lobe. The three species which make 

 a nearer approach are C. tenuicaudata, Haswell, distinguished by the bifid apices of 

 the uropods ; C. caniculata (G. M. Thomson), with practically truncate apex to the 

 dorsal process and the free ramus of the uropods short and thick ; and lastly 

 C. granulata, Whitelegge, which also has the dorsal process truncate, " with three 

 small terminal subspiniform granules." This last species attains a length of 

 13 millims., therefore greatly exceeding in size that which I am here naming after 

 Mr. Whitelegge out of respect for his useful researches in this group. 



The surface is very inconspicuously granular and hairy, only on the pleon and 

 uropods showing these characters at all distinctly. The side-jjlates are similar to 

 those of the preceding species, but having in addition a subcarinate appearance along 

 the upper portion. The pleon, which is as long as head and peraeon combined, has a 

 rounded tooth or projection on either side of the dorsal process at its base, which 

 must be regarded as an additional distinction between this species and C. granulata. 

 It has " a submedian pair of tubercles transversely disposed behind the middle of the 

 terminal segment," such as Whitelegge considers distinctive of the female in his 

 species. 



The first antennae have the flagellum consisting of ten or eleven unecpial joints, 

 with sensory filaments on the last five. The longer second antennae have the last 

 joint of the peduncle decidedly longer than the penultimate, the flagellum longer than 

 the peduncle, fifteen-jointed. 



In the mouth organs it was probably a casual abnormality that the first maxilla 

 had only three setae instead of the usual four on the inner plate. 



The maxillipeds differ from those of C. latreillii by the stronger stem of the second 

 joint, which has a straight outer margin and carries a much wider plate ; also the 

 lobes of the fifth and sixth joints are longer than in the older species. 



First gnathopods : The third joint projects and carries a spine at the middle of 



