432 ARAEOSTERNUS ■WIENECKli, 



regions of the cephalostegite being concave. Lateral mar- 

 gins curved, those of the oniostegite rounded, those of the 

 cephalostegite more sharply defined anteriorly and terminat- 

 ing in an acute extraorbital angle. The convex me- 

 dian part of the cephalostegite passes anteriorly to the 

 broad triangular, a little deflexed front, the concave late- 

 ral parts of the cephalostegite on the contrary to the 

 acute external angles of the carapace. The front is sepa- 

 rated fi'om these external angles by two deep triangular 

 notches, into Avhich the middle-sized eyes project, and 

 extends nearly as much forv^ards as do the external angles of 

 the carapace. The carapace bears no spines as in the Palinuri , 

 but the whole surface is very closely covered with nume- 

 rous small transverse tufts of very short yellow hairs, a 

 few longer hairs being scattered among them. The ante- 

 rior margin of the front and the external margins of the 

 orbital notches are a little denticulate and a small median 

 ridge of a few sharp teeth also occurs on the anterior 

 part of the front. The lateral surfaces of the posterior 

 part of the carapace run vertically downwards, but the 

 rather concave subhepatic regions run obliquely inwards 

 and downwards : the lateral surfaces too are covered with 

 numerous very small tufts of short hairs. The broad 

 triangular front wholly covers the ophthalmic and antennal 

 segments ; the antennal segment is narrow and armed with 

 two small compressed spiniform plates, converging a little 

 towards each other. 



External antennae quite shaped as in the true Palinuri 

 Fabr. (s. s.), the coxocerites and basicerites being wholly 

 coalescent with the epistoma. An antennal scale therefore 

 is wanting too. The ischiocerite or basal joint of the pe- 

 duncle is armed with a small spine at the external angle, 

 the upper surface posteriorly concave, anteriorly convex, 

 the under surface convex and a little rugose , the internal 

 surface concave and smooth ; the anterior margin of the 

 upper surface provided with some yellow hairs. Merocerite 

 or second joint also furnished with a few yellow hairs. 



Ntjt&u from tlie Leyden Museuiu, Vol. 111. 



