464 BULLETIN 54, UNITED STATES NATIONAL MCSEUM. 



genus known from the North Pacific, and the form of the pleon recalls 

 that of /. erostrata Richardson (Aleutian Islands). But it differs (1) in 

 the presence of a long rostrum, (2) in the stronger development of the 

 lateral angulations of the head, (3) in the slightly different angulations 

 of the second and third segments of the pereion." ORTMANN. 



IOLELLA ALASCENSIS Benedict, new species. & 



The head is much broader than long; the rostral projection is 



nearly" as long as the head itself. The rostrum is broad at the base, 

 but narrow and tapering throughout the greater part 

 of its length; the apex is rounded. The sides of the 

 head are laterally expanded and produced forward 

 be}-ond the line of the front; the lateral projections 

 are accentuated b} T a deep concavity occupying the 

 outer half of the front. The antenna 1 are both 

 broken and lost from the distal end of the third 

 article of the peduncles. 



The first segment of the thorax is strongly pro- 

 duced at its posterior half; the anterior half is diag- 

 onal and emarginate. The epimeron is large and pro- 

 duced and placed at the anterior part of the segment. 

 The second and third segments are strong^ produced 

 at both angles with a nearly straight margin between 

 the projections. The epimera are bifurcate and 

 placed between the anterior and posterior projections. 



The fourth, fifth, sixth, and seventh are produced at the anterior 



angles only, the produced portions becoming successively wider. The 



epimera are placed at the posterior angles. 



The pleon consists of a single segment made up of three longitudinal 



lobes; the middle lobe is much narrower and shorter than the outer 



ones; all are rounded at the distal extremity. 



The anterior feet are as in the genus, but the propodus is wide, 



with the basal half of the prehensile edge finely serrate. 



From the line of the eyes to the end of the pleon the specimen is 



sparsely ornamented with very small rounded black spots. 



Described from a single specimen taken by Captain Heal} T , of the 



U. S. revenue steamer Corioin, latitude 71.02 north, longitude 157.46 



west, in 19 fathoms. 



Proc. Acad. Nat. Sci. Phila., LIII, Pt. 1, 1901, pp. 157-158. 



6 The following description is from Doctor Benedict's manuscript, which he has 

 very kindly permitted me to publish at this time. 



c Fig. 519 is through the courtesy of Dr. J. E. Benedict. 



FIG. 519c. IOLELLA 

 ALASCENSIS. 



