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O. Harger—Isopoda from New England. 373 
Art. LV.—Descriptions of new Genera and Species of Isopoda, 
from New England and Adjacent Regions ; by OSCAR HARGER, 
Brief Contributions to Zoology from the Museum of Yale College, 
No. XXXVI 
THE genera and species described in the present paper are, 
except the first, marine and were, mostly, collected by the 
United States Fish Commission, along the New England coast. 
More complete descriptions with figures of all the new, and 
most of the old species, are nearly ready for publication in the 
Report of the Commissioner. As it seems desirable, however, 
to give a wider publication to the genera and species believed 
to be new, the following diagnoses are here inserted. 
Actoniscus, gen. nov.* 
oO 
A. ellipticus, n. sp. Body oval. Head with a prominent 
angular median lobe, and broadly rounded, divergent late 
lo Eyes oval, longitudinal, prominent, black. Antennulee 
rudimentary. Antenne nine-jointed ; first segment short; sec- 
ond strongly clavate; third smaller, clavate ; fourth flattened- 
cylindrical; fifth longest, slender, bent at the base ; 
shorter than the fifth segment, composed of four subequal seg- 
ments, tipped with sete. Terminal segment of maxillipeds 
elongate triangular, ciliated and slightly lobed near the tip. 
First thoracic segment excavated in front for the head, shorter 
above than the following segments except the last, which is short- 
est. Legs small, scarcely spiny. Pleon continuing the regular 
oval outline of the thorax, apparently with four pairs of lamel- 
lar cox, the last pair are, however, the enlarged seg- 
ments of the uropoda and are notched on their inner margins 
for the short outer rami, while the more slender inner rami are 
borne lower down on the under surface. The rami scarcely pro- 
Ject beyond the general outline. : 
Wis ties iG been collected by Professor A. E. Verriil, at 
Savin Rock, near New Haven, and also at Stony Creek, in com- 
pany with Philoseia vittata Say. 
* From axr#, the beach, and Oniscus. 
Am. Jocr. Sc1.—Tamp — Vou. XV, No. 89.—May, 1878. 
