570 PEUICELLINID.^. 



Pedicellina gracilis, Sars. 



Plate LXXXI. figs. 4-6. 



Pedicellina gracilis, Sars, Beskr. og lagttag. 6, pi. i. fig. 2, a, b: Joknst. 

 B. Z. ed. 2, 385 : Goodsir (Forbesia), Ann. N. H. xv. (1845) 

 380, pi. XX. fig. 4 : Gosse, Dev. Coast. 217, pi. xii. fig. 5 : 

 Hincks, Ann. N. H. ser. 2, viii. 360, pi. xiv. fig. 9 : 

 Smitt (part.), (EfV. &c. 1871,1133: Joliet, Bryoz. &c. 

 104, &c. 



Polypides scattered on a delicate creeping stolon. Body 

 somewhat ovate, usually a little gibbous on one side ; 

 tentacles about 20. Peduncle expanded below into a 

 short thick cylinder, above which it is extremely slender, 

 widening slightly upwards to the point of junction with 

 the body, destitute of spines. 



This is a much smaller species than P. cernua, and 

 may be at once recognized by the enlarged base of the 

 peduncle. It is in this portion that the muscular power 

 resides, to which the remarkably energetic movements 

 of the Pedicellina are due, the part above it being a mere 

 rigid rod supporting the body. The basal cylinder varies 

 in length, and in the proportion it bears to the rest of 

 the stem. Occasionally the latter is very much elongated, 

 and consists of several sections separated by knots or 

 swellings, which are also muscular in character. 



Habitat. On Corullina and Laminaria, Hydroida, Poly- 

 zoa (especially Vesicularia) , &c., and under stones, between 

 tide-marks and in shallow water. 



Localities. Jersey ; South Devon, common ; Ilfra- 

 combe ; Swanage and off Lulworth Cove ; Llandudno ; 

 Aberystwith ; Isle of Man ; Fleetwood, on a buoy ; 

 Filey; Lamlash; Oban (T. H.) : Guernsey, on Hermi- 

 one hystrix, with Loxosonia (Dr. M'Intosh) : Cullercoats 



