724 ON A NEW ISOPODAN GENUS (FAMILY ONISCIDAE), 



ligation of this class of animal life, and perhaps further new 

 species may be secured."* 



I suggest the following name and diagnosis for this interest- 

 ing Isopod, the specific name being chosen in honour of Mr. J. 

 Searle, its discoverer. 



Haloniscus Searlei, nov. gen. et sp. (Text-figs 1 to 20.) 



Diagnosis. — Body narrow oval, moderately convex, with lat- 

 eral portions not greatly expanded. Dorsal surface smooth, 

 and, like the appendages, covered with very minute short hairs. 

 Cephalon slightly rounded in front and without lateral lobes. 

 Pleon not greatly narrowed, first and second segments without 

 epimera, third, fourth and fifth with epimera well developed, 

 last segment large and witli well developed lateral portions in ad- 



Text-fig. 1. Haloniscus sear lei, male, side view. 



dition to the triangular extremity. Eyes well developed, lateral. 

 First antenna very minute. Second antenna well developed, 

 flagellum with 3 joints. Mandibles with not more than 2 

 penicils behind the cutting part. Second maxilla with outer 

 edge not angularly produced near the base. Leg's consisting of 

 two series, the anterior four more or less subchelate and of 

 approximately the same size and shape; the fifth, sixth, and 

 seventh simple, longer than the anterior pairs, and increasing 

 in length posteriorly, dactyls bi-unguiculate, without special 

 dactylar seta. Pleopoda with opercular plates greatly de- 



*Victorian Naturalist, xxxv., p. 27. (June, 1918.) 



