332 INVERTEBRATA OF MASSACHUSETTS. 



GENUS PAL^MON, FABR. 



P. VULGA'RIS. "Rostrum acute, with eight or nine teeth above, 

 and three or four beneath ; fingers of the larger pair of feet shorter 

 than the hand." Say. 



Palse^mon vulgaris, SAY ; Journ. Acad. Nat. Sc., i. 248. MILNE-EDW. ; Hist. Nat. 

 des Crust., ii. 394. 



This animal answers to the Prawn of Europe, and is nearly 

 certain to be identical with the Palcemon squilla of Europe. But 

 I have not yet had an opportunity of actual comparison. It is a 

 little larger than the shrimp, and is known by the long, upturned, 

 toothed rostrum. It is less than an inch and a half in length. 



GENUS PANDALUS, LEACH. 



P. ANNULICO'RNIS. Antennae, marked with rings alternately 

 white and red. 



P. annulicornis, LEACH ; Malacol., fyc., tab. 40. LATH. ; LAM.; DESM. ; Consid. 

 220, pi. 38, f. 2. MILNE-EDW. ; Hist. Nat. des Crust., ii. 384. GRIFFITH'S 

 Cuv., (Crust.) pi. 17, f. 3. 



A beautiful animal about four inches long, with very long an- 

 tennag, elegantly annulated with white and red, and with a long 

 beak like Palae mon, from which it is distinguished by having pin- 

 cers on the second pair of feet only, instead of the first two pairs. 

 I have found it only in the stomachs of ,fishes. 



GENUS HIPPOLYTE, FABR. 



H. ACULEA'TUS. Rostrum recurved, slender, spear-pointed, 

 serrated ; segments of the body terminating each side in a rejlexed 

 spine. 



Cancer aculeatus, FABR. ; Fauna Grcenl., 239. 



Alpheus aculeatus, SABINE ; Append, to Parry's Voy., 237, tab. 2, f. 9, 10. Ap- 

 pend, to Beecheys Voy. 

 Hippolyte aculeatus, MILNE-EDW.; Hist. Nat. des Crust., ii. 380. 



About an inch in length, having the internal antennae very short 

 and many-jointed, a compressed, spear-pointed rostrum, and the 



