ON HEBRIDEAN CRUSTACEA, ECHINODERMATA; POLYZOA, ETC. 205 



level of the polyzoary, all inclining towards distal extremity of branches, 

 thouo-h bending slightly towards the side of the polyzoary to which they are 

 nearest. Colour white. On stone and shell. The Minch and Shetland in 

 deep water. 



A. conipacta approaches more nearly to A. dilatans than to the other de- 

 scribed species, but is much smaller and more delicate in all its parts, and 

 depressed flat to the surface instead of being raised in a swollen cushion-like 

 manner. A. dilatans is usually tinged with violet, while A. com^acta is 

 always white, and approaches in many respects to a Diastopora. 



Class Htdrozoa. 



Hahciimi c/enicidatiim, Norman, n. sp. 

 Hydrosoma slender, branching, the branches (in tyi)e specimen) all in the 

 same plane ; branchlets flexuous, bending alternately right and left between 

 the hydrothecfe (as in Laomedea genicidata) ; one hydrotheca to each internode; 

 the internode terminating immediately above the hydrotheca and marked by 

 a single stricture, or more rarely two. IIydrotheca3 diverging at about an 

 angle of 45° from the ccenosarc, miich elongated, simply tubular, fully two- 

 thirds as long as the internodes of the coenosarc, and 3-6 times as long as 

 their own diameter ; a constriction near the base, at the point where the more 

 strongly developed chitine of the base of the hydrotheca is exchanged for a 

 membrane of more delicate structure. Height an inch and a half. Dredged 

 in deep water in the Minch. 



Ilalecium sessile, Norman, n. sp. 



Hydrosoma slender, irregularly branching, branches not in the same plane ; 

 branchlets having alternate hydrothecte, and a single constriction above each 

 hydrotheca. Hydrothecae very short and perfectly sessile, not rising at all 

 separately from the hydrosoma, of the lateral projections of which they are 

 mere openings, without being raised into any tube. Polypites large, not re- 

 tractile, very narrow at the base, where they rise from the hydrotheca, thence 

 gradually widening to near the summit, where they suddenly swell into a 

 wide campanulate mouth surrounded by long and slender filiform tentacles ; 

 the polypites rise above the hydrotheca to a height (exclusive of tentacles) 

 which is not less than five times its diameter, and far overtop the level of the 

 succeeding hydrotheca. Height ijrobably an inch and a half, though the 

 fragments obtained are not more than half that length. Dredged in deep 

 water in the Minch. 



The following is a list of the species which are now for the first time re- 

 corded as members of the British Fauna. 



Hippolyte cultellata, Nornmn, n. sp. Mrera Loveni, Bru::* 



Diastjlis lamellata, Norman, n. sp. Eriopis elongata, Bru::* 



Ipliithoe serrata, Norman, n. sp. Pleiirocrypta Galathea?, Hc&&e'i\ 



Anonyx nielanophthalmus,.A'bnw«?i, n. sp. Paracjpris polita, Sars §. 



Euonyx chelatus, Norman, nov. gen. et sp. Pontooypris aciipunctata, Brady, n. sp. 



Ampelisca carinata, Bruz. * trigonella, Sars §. 



tenuicornis, LilljA Bairdia obtusata, Sars §. 



macrocephala, Lillj. t ■ complanata, Brady, n. sp. 



Microprotopus maculatus, Norman, nOT. Cytliere viridis, il/«/fer ||. 



gen. et sp. tenera, Brady, n. sp. 



* Bidrag till kannedomen cm Skandinaviens Ampliipoda Gammaridea, 1859. 



t Ofvers. af Kougl. Vetensk. Akad. Forhandl., 1855, pp. 123, 137. 



\ Annales des Sciences Naturelles, Cinquieme Serie, torn. iii. (1865) p. 226, pi. 4. 



§ " Oversigt af Norges Marine Ostracoder," Vid.-Selsk. Forhand. 1865. 



II Entomostraca, p. 64, tab. vii. figs. 1, 2 (and of jSars, but not of Lilljeborg). 



