394 REPORT OP COMMISSIONER OF FISH AND FISHERIES. 



lobe of the head. Exteriorly they form about two-thirds of the lateral 

 margui of the head. Their interior boundary is in the form of three 

 sides of a hexagon, separated at their nearest points by a little more 

 than the transverse diameter of the eye. The antennulse are about as 

 long as the head, composed of eight segments and separated at the base. 

 The first segment is short and . stout ; the next two a little longer, but 

 scarcely distinguishable from the following five flagellar segments, which 

 decrease in size to the last. The antennae are comijosed of ten segments. 

 They are more slender than the antennulce, and surpass them by about 

 two segments. The first two segments are broader than the following 

 three, which are also somewhat larger than the five flagellar segments. 



The first thoracic segment is shorter than the head, but much longer 

 than any of the succeeding segments, which to the sixth are of equal 

 length, each about one-third shorter than the first. The seventh segment 

 is about one- third shorter than the sixth. The fifth and sixth are broadest, 

 each being about one-third broader than the first. The epimera do not 

 project behind the angles of the segments to which they are attached. 

 The legs differ but little throughout. The first pair are shortest, and 

 the first three pairs are somewhat stronger than the last four, which are 

 armed with a few scattered short spinules. The seventh pair are the 

 longest. 



The pleon is a little longer than the seven thoracic segments. The 

 fifth segment is broader behind than in front, and the last segment is as 

 broad at the insertion of the uropods as the third segment, and is rounded 

 behind. Anterior pleopods with the basal segment nearly square. The 

 uropods are unlike on the opposite sides in the specimen figured. The 

 normal form is probably seen in the right uropod, which surpasses the 

 telson by less than half the length of the outer ramus. This ramus is 

 longer than the inner, narrow, with nearly parallel sides and is obliquely 

 truncated at the tip. The inner ramus is somewhat diamond-shaped. 

 The ciliation is nearly rudimentary and might be overlooked. The basal 

 segment is alike on the two sides and has the inner distal angle acute and 

 but slightly produced. 



Length 13™™, breadth 3.6'"°'; color in alcohol yellowish, with minute 

 black specks most abundant on the pleon ; eyes black, conspicuous. 



The specimen was obtained June 1, 1874, by Mr. S. F. Clark, at Savin 

 Eock !, near New Haven, from the mouth of a squid {LoIigoFealii), whence 

 the specific name. Two specimens " parasitic on young mullet" are in the 

 Yale College Mnseum, collected at Fort Macon!, N. C, by Dr. H. C. 

 Yarrow, which appear to belong to this species, showing that it is not 

 confined to the squid. 



Livoneca Leacli. 

 Livoneca Leach, Diet. Sci. nat., tome xii, p. 351, 1818. 



Head small, projecting in front over the bases of the antennulae, which, 

 like the antennte, are short ; legs all alike and armed with strong curved 

 dactyli ; body broad, oval, often obliquely distorted. 



