Massy — The Hohthiirioidea of the Coasts of Ireland. 53 



Phyll. pelhccidus — Posterior end of body not narrowed ; podia scattered ; 

 colour in alcohol brown ; tentacular spicula without perforations, and armed 

 with spikes; collar short, without prolongations. 



One of our specimens of Fs. mixta measures 30 mm. in length, and has a 

 collar of 6 mm., and one long simple polian vessel, with a dilation near the 

 anterior portion, and another at the distal end. 15 small white oblong 

 " buds," arranged in a row on wall of mesentery, appear to be gonadial tubes 

 at an early stage of development. There are 20 tentacles, some of which are 

 larger than the rest. Another specimen measures 53 mm. in length, and has 

 a collar of 12 mm. There are at least 13 tubes in the gonad, mostly bifur- 

 cated, and some divided into 3. Of the Kilkieran specimens, one measures 

 34 mm. in length, and has a collar of 8 mm. There are 10 small inner 

 tentacles, and 10 long outer ones. The gonad contains ca. 76 tubes of 

 3-4 mm. in length ; about 32 of these are bifurcated near the base, and a 

 very few have 3 branches. The narrow simple polian vessel measures 11 mm. 

 in length. The other specimen measures 23 mm. in length, and has 19 large 

 and small tentacles. The gonad contains 6 tubes, of which 5 are bifurcated. 

 The collar is 5 mm. in length, and shaped liked the others, i.e., with forked, 

 radial-beaded prolongations, and unbifurcated inter-radial pieces. The polian 

 vessel measures 7 mm. 



Ostergren (1906, p. 8, figs. 1-3) gives figures of the calcareous collar in 

 Ps. mixta. He considers the species to be of southern origin, reaching 

 western Europe with the warm currents of the Gulf Stream. 



Distribution. — Arcachon to western Norway and Faroes (Ostergren, 1906). 



Psolus Fabricii (Diib. & Kor.), 1844. 



Cuvieria fabricii, Diib. & Kor. 



Two hauls made in different years at 51° 20' N., 11° 35' W.. at soundings 

 of 406-460 fms., proved that this species lives in abundance in the deep 

 water off south-west Ireland. 17 specimens were also taken off Eagle Island, 

 Co. Mayo, in 2 hauls, at soundings of 350-388 fms. (Kemp, 1905, p. 185). In 

 our specimens, as far as examined, the deposits of the foot-sole closely 

 resemble Bell's illustration (1892a, pi. 6, fig. 2). The podia are supported by 

 terminal discs, with many perforations, and also by irregular-shaped plates, 

 with 21 holes or less, and curved perforated rods. The sexes can be distin- 

 guished through the thin foot-sole by the gonad, which consists either of a 

 twisted skein of narrow white tubes (found to contain long dark Classes 

 when examined microscopically), or a yellowish bunch of about 24 short 

 thick tubes filled with spherical granules. One large globular polian vessel 



SgiENT, PKOC, K.D.S., VOL. XVI., NO. IV. Q 



