77 



and furniture of the uropods and the antenna] squama in Lycomysis are in the: main as in the 

 Mysinae and especially as in tlie tribe Mysini, thus very distant from the features in the Siriellina- 

 and Gastrosaccinae. Unfortunately the male pleopods are so imperfectly developed in my specimens, 

 that they cannot afford any real help for deciding the systematic position of Lycomysis, yet it 

 may be stated that they show that it cannot be referred to the Mysini, and that the exopod 

 of the fifth pair being twice as long as the endopod is somewhat anomalous. 



The facts enumerated prove that this most interesting new genus does not fit well in 

 with any of the tribes of the subfamily Mysinae, with the result that either a new tribe within 

 this subfamily or a new subfamily is to be established for its reception ; in the former case the 

 diagnosis of the subfamily Mysinae must be altered and enlarged. But it may be advisable to 

 postpone the decision until adult specimens of both sexes, at least adult males, have been 

 found and studied. 



44. Lycomysis spinicauda n. sp. PI. XI, figs. ^a — 3/; PI. XII, figs. 2a — 2I1. 



Stat. 204 — 207. September 20 — 21. Buton-strait (Between lat. 4 20' S. and lat. $°f.S S., long. 

 I22°58'E. and I22°39'E.). Plankton, surface. 3 immature males. 



Description of the immature Male. — Frontal plate (fig. 2 a) rather short and 

 small, with the lateral margins a little concave, and anteriorly somewhat narrowly rounded. 

 Eyes very large, black; distal joint of the eye-stalks moderately long, with the margins convex. 

 Antennal squama a little more than five times as long as broad, reaching about to the end 

 of the antennular peduncle; terminal joint somewhat longer than broad. Exopod of the uropods 

 scarcely reaching the end of the terminal spines of the telson (fig. 2g), more than eight times 

 as long as broad, with the end somewhat broad, transverse. To the main features of the telson 

 pointed out in the description of the genus the following particulars may be added; it is two 

 and a half times as long as broad at the base and nearly four times as long as broad at the 

 middle; on the upper surface near each lateral margin 11 or 12 spines are found, rapidly 

 increasing in length from the first very small to the fourth or fifth spine, and then preserving 

 the same length to the last upper spine ; the real lateral spines are between twice and thrice as 

 many as the dorsal spines and can be counted only from below (fig. 2//); a similar moderately 

 small spine is inserted below the very long spine on the postero lateral angle ; this outer pair 

 of very long terminal spines taper gradually from near the base to the acute end, while those 

 of the inner long pair begin to taper beyond the middle, and the end is even flattened and 

 rounded. — Colour light brownish, without dark spots. 



Length of one of the immature specimens 4.2 mm. 



