94 Notes on North American Crustacea^ 



" H. parvifrons " being that described below under the name 

 Herhstiella camptacantha. 



Hei*b!!^tiella camptacantha, nov. sp. 



Ilerbstia imrdifrons Stimpson, Notes on N. American Crust., p. 57 (Annals 

 Lye. Nat. Hist. N. Y., VII (1860), 185) ; not of Randall. 



A more careful consideration of the terius of Randall's de- 

 scription of //. parvifrons (Jour. Acad. Nat. Sci. Pliila., YIII. 

 lOY) leads me to believe tliat the species noticed by me under 

 that name cannot be the same as that meant by that author. 



In II. camptacantha the carapax is but slightly convex, and the 

 surface is very regularly and conspicuously punctate. The cervical 

 suttire is deep and well marked, but the sulci separating the branchial 

 from the cardiac regions are very shallow, and there is no sulcus 

 whatever between the branchial and the rather flattened intestinal 

 region. There ar^ twenty small tubercles on the carapax, not includ- 

 ing the marginal spines. Of these tubercles there are five on the 

 gastric region, four of which are arranged in a transverse line across 

 the middle, the two on either side being approximated ; three on the 

 cardiac region, two on the intestinal, and five on each branchial re- 

 gion. On the margin of the carapax on each side behind the orbit, 

 there are fourteen spines ; five on the antero-lateral and nine on 

 the postero-lateral margin. The posterior spines are very small, 

 blunt, or tuberculiform ; but the anterior ones are larger, and, like the 

 spines on the legs, abruptly bent at the tip, so that they have a 

 truncated appearance, with the sharp apex pointing forward. There 

 is a similar spine and two smaller ones on the subhepatic region ; and 

 the oblique ridge separating the pterygostomian from the subhepatic 

 region is armed with five spines, the anterior three being small and 

 tooth-like. The horns of the rostrum are rather large and divergent ; 

 they form considerably more than half the lengtli of the rostrum, and 

 their tips as well as those of the anteimal spines are bent inward. All 

 of the spines are much more acute in young specimens than in adults. 

 The chelipeds are long, and the meros-joint is armed with numerous 

 (about 13) blunt spines on the outer side ; the carpus is tuberculated 

 above ; the large and compressed hand is perfectly smooth, and un- 



