276 Rev. A.M. Norman oil some undescribed 



the former it may be known by the larger number of teeth on 

 the under side of the rostrum, from the latter by the presence of 

 the tooth near the base of the rostrum above ; from both by the 

 single pair of spines on the telson. The remarkable elongation 

 and slenderness of this species is, however, its most marked 

 characteristic. It is quite a Mysis in form, and indeed, when I 

 first took the species, I was under the impression that it belonged 

 to that genus. The dredge came up one day in Lamlash Bay, 

 Arran, full oi Laminar ue, among which were hopping numerous 

 Hippolyte ' (varians, Cranchii, pandaliformis, &c.) and Pandali 

 {annulicornis and T/iompsoni) : from these I at once singled out 

 what I took to be a Mysis I had never seen before ; the specimen 

 Was accordingly bottled, when, on reaching home, examination 

 proved it to be the Hippolyte now described, 



The colour, when alive, was a deep green (not so vivid as in 

 H. viridis), with a black line down the back of the abdomen. 



The species measures 1 inch from the extremity of the rostrum 

 to the end of the telson ; length of carapace T 2 inch, of rostrum 

 T 3 jj inch ; greatest depth of carapace T \j inch. 



Genus Dorypiiorus *, n. g. 



Rostrum, oculi antenncequo eadem quae in Hippolyte. Abdominis 

 segment am tertium pone non productum. Spina antennarum in- 

 teriomm magna. Maxillipedum articidus ultimus cylindricus, cili- 

 atus, spinalis (non in pectinis formam dispositis) paucis ad apicem 

 instructus. Pedes primi secundique inter se maxillipedibusque fere 

 pares, manibus clongatis instructi ; secuudi carpum annulati. 



Rostrum, eyes, and antennas as in the genus Hippolyte; the 

 spine at the base of the internal antennae large. Last joint of pe- 

 dipalps cylindrical, ciliated, ending in a few spines, which, how- 

 ever, are not disposed in the form of a comb. First pair of 

 feet much longer than in Hippolyte, about equal to the pedi- 

 palps and second pair of feet ; third, fourth, and fifth pairs of 

 feet long and slender, exceeding the first two pairs. Wrist of 



his ' Popular History of British Crustacea,' quotes a note of mine, in which 

 I stated my opinion that 11. Mitchcllii was a variety of 11. varians. That 

 opinion I now retract. I had then only seen two small specimens of 

 " Mitchellii ;" but having since taken that form as well as " Whitei " in 

 considerable numbers at Jersey, Guernsey, and Bantry Bay, I am now 

 satisfied that Mr. Thompson's Hippolytes are varieties of one species, which 

 may always be known from varians by the absence of teeth on the upper 

 side of the rostrum, as well as by its more produced form and larger size. 

 The species would seem to be identical with Hippolyte viridis (Otto) (Al- 

 p/ieus viridis, Otto, Mem. de l'Acad. des Cur. de la Nat. de Bonne, lxiv. 

 pi. 20. f. 4 ; Hippolyte viridis, Milne-Edwards, vol. ii. p. 3/2). 

 * Aopvcpopos, a spear- bearer, lancer. 



