DAPHNIOIDEA. 



1275 



rostrato, rostro gracili, acuto, ad corpus strict]* appresso; superne visus, 

 antice latissimd truncatus, f route parce angustiore quam corpus, postice 

 breviter triangulatus et obtusus. 



Very tumid : in side view rotund, head not separate, very short, 

 beaked, beak slender and close to body, acute ; in upper view ani- 

 mal very broad truncate anteriorly, the front therefore nearly as 

 broad as body, behind low triangular and obtuse. 



Plate 89, fig. 7 a, side view of animal, enlarged, the heart at li; b, 

 upper view. 



Fresh-water pools, on Yanua Lebu, Feejee Islands. 



The form of this species corresponds with that of the Chydorus of 

 Baird ; a subgenus which may be sustained, but should rest on better 

 characters than those published. The front margin (as seen in an 

 upper view) is more than three-fourths the greatest breadth of the 

 body. The slender pointed beak is very close to the body, and no 

 distinct head was made out. The eye is just above the beak. In 

 profile, the length exceeds very slightly the height, and the curve be- 

 hind is nearly a regular semicircle. The abdomen is broad and has 

 a truncate apex ; there are two minute setse near dorsal base at an 

 abrupt narrowing of this part of the animal ; and at apex there are 

 two spines about as long as breadth of abdomen, besides others which 

 are much shorter. 



Lynceus latifrons, Dana, Proc. Amer. Acad. Sci. ; ii. 48. 



Family POLYPHEMID^. 



Genus PLEQPIS, Dana. 



Corpus quoad thoracem abdominemve non deflexum, rectiusculum. Ab- 

 domen crassum, extremitate furcatum, setis apicalibus nullis. Testa 

 postice rotundata. Antennarum posticarum rami 3-articidati. 



