30 



Gr. 0. SARS. 



[No. 7. 



tation, indicating the presence of the numerous transverse pillars 

 connecting the outer lamella of the carapace with the inner soft 

 coating. 



The eye is considerably remote from the front, lying near 

 the middle of the inferior edge; it is not very large and exhi- 

 bits a very limited nnmber af crystalline lenses imbedded in a 

 blackish pigment. 



The ocellus is much smaller than the eye, and located at a 

 short distance posterior to that organ. 



The antennulse, originating close together from the ventral 

 part of the head, immediately in front of the labrum, are rather 

 elongate and slender, of a narrow cylindrical form and slightly 

 divergent. They are quite straight and exhibit a short rounded 

 basal joint, the tip provided with the usual foscicle of sensory 

 filaments, two of which project considerably beyond the others. 



The antennas (see fig. 1) are rather powerfully developed, 

 the scape being very thick and muscular, considerably longer 

 than the head, the greater part of which it conceals on viewing 

 the animal from the side (see fig. 1). It has numerous circular 

 folds extending far beyond the middle and giving it great flex- 

 ibility. On a small tubercle at the outer side occur the two 

 usual delicate bristles, and at the somewhat tapering extremity 

 is observed on each side a slender spine. The branches are 

 rather elongate, though somewhat shorter than the scape, and, 

 as in the other species, of cylindrical form, slightly tapering 

 distally. The lower branch is Particulate, the upper four- 

 jointed, both provided at the apex with a slender spine and 3 

 exceedingly long and slender natatory setse; the lower branch 

 has besides 2 additional somewhat shorter natatory sets, affixed 

 to the 2 preceding joints, whereas the upper branch exhibits at the 

 outer edge of the 2nd joint a short spine only. All the setae 

 are distinctly biarticulate, but wholly devoid of the usual delicate 

 cilia. 



The oral parts and legs exhibit the structure characteristic 

 of the genus, and may partly be observed through the shell. 

 In particular the large rounded lamellae (exopodites), affixed to 



