234 Dr. W. T. Clahnan on 



In addition to the species mentioned above tliere occurred 

 (haul 1 b) numerous specimens of a species probably belongino- 

 to the family Aoridae, None of the specimens exceed 4 mm. 

 in length, and only in a few of the more minute are the 

 antenimles and antenna? preserved. In the absence of adult 

 specimens it does not appear jwssible to identify the species. 



[d] M Y S I D A C E A. 

 Pseudomma sp. 



Among a number of minute specimens of Mysidacea 

 (haul 1 b), too immature for identification, there is one, 

 belonging to the genus Pseudomma, vvhicli deserves mention, 

 since, so far as I can discover, no species of the genus has 

 hitherto been recorded from the surface *. The specimen, 

 which measures 3 mm. in length, is further remarkable in 

 possessing on each side of the plate which represents the 

 metamorphosed and coalesced ocular peduncles a well-defined 

 crescentic mass of bright red pigment. In the species 

 hitherto described the ocular pigment is completely absent. 

 The specimen approaches Ps. roseuin, Sars, in the shape of 

 the antennal scale, which has the external tooth very little 

 beyond the middle of its length, and in having four spines on 

 the truncated distal end of the telson. It differs in the 

 absence of distinct serrations on the margin of the ocular 

 plate and in the presence of only three pairs of lateral denticles 

 on the telson. These denticles are not articulated spines, 

 but I learn from Mr. W. M. 'i'attersall that this is probably 

 a character of immaturity, since in allied genera the spines 

 are at first formed as teeth, which later become articulated. 



[e) C U M A C E A. 

 Leptostyh's (?) insidarum, sp. n. (Figs. 1-5 a.) 



Description of adult female. — Total length 9"3 mm. 



Carapace a little more than two sevenths of total length, 

 nearly twice as long as deep and 1^ times as long as broad, 

 its dorsal surface not strongly arched. Pseudorostrum hori- 

 zontal, acute, about \ of total length of carapace. Antennal 

 notch obsolete. Ocular lobe a little broader than long, 

 inflated, without pigment. Frontal lobe crossed by two low, 

 rounded, crescentic, transverse ridges. Near the posterior 



* Ps. australe is recorded b}' Sars from 33 fathoms at the entrance to 

 Port Philip, in company with Decapod larvae. Other species are on 

 record from depths of 45-1675 fathoms. 



