LEPTOSTRACA, SCHIZOPODA AND STOMATOPODA. 185 



Gouerichthus y. Plate TIT., figs. 16 to 47. 

 Localities : 



Off Kalpentvn Island, surface tow-nets all night. Twelve specimens, from 4 to 7 

 niilliius. in length from the eye to the telson. 



( Jheval Paar, surface tow-net. Three specimens, 5 to G millims. long. 



This Gonerichthus is very closely allied indeed to the last, and the description 

 there given will answer for this species, save in the following particulars : - 



Rostrum (tigs. 46 and 47) comparatively much shorter, the length from the antero- 

 lateral spine to its tip being much shorter than the length from the anterolaterals to 

 the postero-median dorsal spine ; only three or four teeth on its ventral edge. 



Ante ro -lateral spines of the carapace, though still small, are more developed than 

 in type /3. 



Paste ro-lateral spines relatively much shorter, and only extend about half way 

 down the second abdominal segment. 



Telson, while agreeing in general shape and armature, is comparatively a little 

 broader. 



The above comparison between the types /3 and y is drawn up from specimens of 

 the same size, 7 millims., and at the same stage of development. Figs. 46 and 47 

 show the carapace of the type y in dorsal and lateral view respectively, and the 

 differences between types /3 and y are readily seen in comparison with figs. 44 and 45, 

 in which the carapace of type /3 is shown. Type /3 at 4 millims. has a carapace of 

 about the same proportions as type y at 7 millims. (see fig. 43). It seems clear from 

 this that the larvae /3 and y are distinct and belong to separate though closely allied 

 adults. 



S> K 



