ISOPODS OF NORTH AMERICA. 



43 



'"The males, which are known ])y the cylindro-cohimiiar sexual 

 or^an situated ])etwcen the last periBopods, where it takes the place of 

 the ventral spine of the other sex, differ in having- the lateral spines 

 of the perjfion-segments, and 

 both epimeral and ventral 

 spines of the pleon, so much 

 reduced in size as to become 

 almost obsolete, while the ven- 

 tral spines of the earlier seg- 

 ments of the body are as large 

 as in the female, and the hand 

 of the first legs is not more 

 largely developed than in the 

 other sex. All these points are 

 contrary to what is usual, and 

 not what might have been ex- 

 pected to characterize the male. 

 * * * Length half an inch." — 

 Norman and Stebbix(;. " 



APSEUDES TRIANGULATUS 

 Richardson. 



Apseudes triangulata Richardson, 

 Trans. Conn. Acad. Sciences, 

 XI, 1902, pp. 280-281, pi. 

 XXXVII, figs. 1-5. 



Local It y . — H a r 1" i n g t o n 

 Sound, Bermudas. 



Body narrow, elongated, sur- 

 face smooth. 



Head with frontal margin 

 produced at the middle in a ros- 

 trum like a spear point, the 

 sides of which near the base 

 are excavated below the lateral 

 expansion of the rostrum. On 

 either side of the excavation 

 thus formed the margin is 

 acutelv produced in a small 

 anterior process. Lateral to 

 this process is the ocular proc- 

 ess, which is produced anteriorly about the same distance. The 

 eyes are distinct and black and occupy almost the whole surface of 

 the ocular lobe. 



Fk;. 36.— Apseudes TRIANGULATUS. a, Segments of 



THORAX AND ABDOMEN. 6, HEAD. X 35. C, SEG- 

 MENTS OK ABDOMEN AND PART OK UROPODA. d, 



First gnathopod. e. Second (jnathopod. 



f'Tran.s. Zool. Soc. LoiuL, XII, 1886, Pt. 4, pp. 95-97 



