278 Rev. A. M. Norman on some undescribed 



Genus Dennisia, n. g. 



Rostrum, abdomen ocidiqxxe eadem quae in Ilippohjte. Antenna et 

 externa? et internee squama basali ornata? ; internee tribus flagellis 

 confecta?. Maxillipedum articulus ultimus cylindricus, ciliatus. 

 Pedes primi maxillipedibus longiores, manibus elongatis instructi. 



Rostrum, abdomen, external antenna?, and eyes as in the genus 

 Hippolyte ; the internal antenna? have the basal joint compressed 

 and flattened out into a scale similar in form to that attached to 

 the external antenna?, but smaller ; their filaments are similar to 

 those of the genus Athanas, the thicker of the two ordinary fila- 

 ments being divided and sending out a slender branch near its 

 termination. The last joint of the pedipalps is cylindrical and 

 ciliated, not spinose. The first feet are longer than the pedi- 

 palps, and have lengthened hands, as in the genus Palcemon. 

 The second feet in my specimens are injured, and I am con- 

 sequently unable to draw characters from them. The palp of 

 the mandibles appears to consist of a single joint. 



Dennisia sagittifera, n. sp. PI. XIII. figs. 8-13. 



Scutum antice dentatum atque carinatum. Rostrum horizontale, 

 cultrellatum, squamam antennarum exteriorum paulo superans : 

 denies marginis superioris octo, quorum duo in scuti carina positi ; 

 marginis inferioris ties ; dentes ciliati. Mar go scuti anterior duo 

 aculeorum paria infra oculos posita gerens. Telson duobus acu- 

 leorum paribus ornatum. 



The fore part of the carapace keeled. Rostrum nearly straight, 

 a little longer than the scale of the exterior antenna?, and deep 

 in proportion to its length ; of the eight teeth which are on the 

 upper edge, two are on the carapace and six on the rostrum 

 itself; below there are three teeth : all the teeth arc ciliated. 

 There is a spine at the origin of the external antenna?, and a 

 second spine on the carapace behind and a little below the first. 

 Third segment of the abdomen gibbous and produced behind, 

 as in the genera Hippolyte and Pandalus. There are two pairs 

 of spines on the telson. 



The colours of this species were very vivid and extremely 

 beautiful when alive. The carapace was pale green, delicately 

 spotted and mottled with brown ; the abdomen very pale lilac, 

 elegantly painted on the third segment with a chevron of a 

 bright lilac (from this mark the specific name is derived), and 

 before this were two oval brown spots. The legs were prettily 

 banded with violet. 



Among many rare Crustacea which were dredged by the 

 Rev. R. N. Dennis and myself at Jersey, in 1859, was the pre- 

 sent species. It was found among Zostera from about 4 fathoms 

 water in St. Catherine's Bay. I have named the genus after 



