CKTJSTACBA. 303 



beyond the distal extremity of the terminal segment. Colour (in 

 spirit) yellowish white. The length of Dr. Coppinger's largest spe- 

 cimen is little over 8| lines (18 millim.) ; but the largest example 

 in the British-Museum collection is of much greater size, measuring 

 not less than 1 inch 2^ lines (31 millim.). 



Two specimens were dredged in the Arafura Sea, 32-36 fms. 

 (No. 160). 



There are in the British-Museum collection several specimens 

 collected in Torres Straits (J. B. Jukes). AU of these appear to be 

 of the male sex. The terminal segment (only) is slightly pubescent 

 above. , 



The mandible closely resembles that of G. hirtipes as figured by 

 Milne-Edwards*, in its truncated and strongly dentated apex, sen- 

 sorial appendage, and triarticulate palpus ; the, maxillipede is also 

 formed on a precisely similar type to that of O. hirtipes. 



The form of the interantennal plate, which somewhat resembles 

 that of certain JEgcB (e. g. .^ga spongiophila), and of the lateral pro- 

 longations of the second to fourth segments of the postabdomen at 

 once distinguish this species from Cirolana hirtipes, M.-Edw., and 

 C rossii, Miers, and from Cirolana (Eurydice) swainsonii. Leach, a 

 Mediterranean and West- African form, to which O. schi'ddtei is very 

 nearly allied, ^ga novizealandice, Dana, and Cirolana latistylis 

 and orientalis, all of them forms somewhat insufficiently described, 

 appear to be distinguished by the much more rounded and less 

 triangulate terminal segment, &c. C. arahica, Kossmann, to judge 

 from his figurest, is distinguished by the form of the rostrum, 

 terminal segment, and interantennal plate both from this and the 

 following species. 



5. Cirolana tenuistylis. (Piate XXXIII. fig. B.) 



As this species in many particulars nearly resembles the foregoing, 

 it may suffice here to point out its chief distinctive characters. The 

 interantennal process is narrow-linear, as in C. rossii or C. hirtipes, 

 but the eyes are subquadrate or somewhat rounded, with very large 

 ocelli, and each occupy less than one fourth of the total length of the 

 front and lateral margins of the head, which has a more prominent 

 median frontal process. The antennules have the first two joints of 

 the peduncle more dilated, the second very short, the third robust, 

 but less dilated than the preceding ; the last two joints of the peduncle 

 of the antennse are shorter than in C. schi'ddtei. The third and 

 fourth joints of the ambulatory legs are considerably dilated and 

 margined with stiff setae. The inner ramus of the uropoda is much 

 narrower than in C. schiodtei, with the sides parallel to near the 

 extremity, which is subacute. The length of the largest specimen 

 is about 7 lines (15 millim.). 



A single specimen, I think a male, is in the collection from Prince 



* Atlas in Regne Animal de Cuvier, Crdst. pi. Ixvii. fig. 8. 



t Zool, Brgebn. Eeis. roth. Meer. ii. p. 1 14, pi. viii. figs. 7, 11 (1880). 



