GEPHYREA. 
543 
land); cerstedi^ Kef.; horeale^ Kef.; digUaium^ ep. n., p. 11, pi. ii. 
fig. 9, and v. fig. 21, and p. 377, fig. 9 (Fiumark, Greenland) ; pyriforme 
[nec Dan.], p. 12, pis. i. fig. 4, and iv. fig. 22, and p. 378, fig. 2 (Norway, 
Sweden, 25-90 metres). 
The true “ Sipunculus pyriformis,’^ Dan., is now made the type of 
Onchnesoma, g. n., Koren & Danielssen (2, p. 133). “ Body small, pear- 
shaped ; proboscis long ; vent a little before the base of the proboscis ; no 
tentacles and no vascular system ; a single retractor.” 0. steenstrupi, 
K. & D. {S. pyriformis, D., Phascolosoma pusillum, Sars, MS. ; 0. sarsi, 
K. & D. (P. IcBvissimum, Sars, MS.) (Lof ten, 2-300 fath.) [P. pyriforme of 
Th^el has 2 retractors, 20 long filiform tentacles, 1 vessel with numerous 
ramifications, &c.]. 
Sipunculus norvegicus, D., K. & D., 1. c. ; S. priapuloides, sp. n., iid. 
ibid. (Korsfjord and Sondfjord, 100-150 fath.). 
Tylosoma, g. n., iid. 1. c. p. 134. “ Body cylindrical, closely covered with 
papillae ; the small round prominent mouth is situated on the broad, 
obtuse, shield-shaped portion of the body ; the vent immediately behind ; 
back part of the body pointed, conical ; no proboscis, no tentacles, and 
no vascular system.” The typical species, T. luetheni^ sp. n., id. ibid. 
(Dalsfjord, Herlofjord, 50-80 fath.), has a single segmental organ and 
cannot be identified with the following species : — 
Aspidosiphon mirabilis, sp. n., Theel (5) \nec Linn.], p. 17, pis. i. fig. 6, 
pi. iii. figs. 12-15, and p. 386, pi. xiv. fig. 15 (Gullmaren). 
Priapulus glandifer and brevicaudatus^ Ehl., are enumerated as distinct 
species by Th^iel (1. c.), the last-named species as occurring at Spitz- 
bergen and Greenland, 800 metres; while Koren & Danielssen (2) 
unite them with P. coAidatus^ Lmk., having convinced themselves of the 
instability of the characters. Halicryptus spinulosus, Sieb., occurs at 
Spitzbergen and in the Baltic, from Braviken to Ystad ; P. caudatus like- 
wise in the Baltic, the most northern point being 58° 6' N. L. : Th^el, 1. c. 
P. bicaudatus, Dan., is made the type of st, new germs, Priapulopsis, Koren 
& Danielssen, 1. c. p. 135 : “ proboscis formed by the anterior portion of 
the body ; mouth provided with teeth ; vent posterior, on each side of it 
a long, cylindrical, vesiculate appendix (gill ?) ; genital pores obliquely 
placed below the vent.” P. typica, K. & D. (P. bicaudata, D.). 
Chrystallophrisson nitens, g. & sp. nn., Mobius (Bericht, &c., p.l57, pi. iii. 
figs. 5-12), is [as acknowledged by the author in a letter to the Recorder] 
identical with Choetoderma nitidulum. 
A note on the rediscovery of Chcetoderma during the deep-sea researches 
of the “ Challenger” Expedition at great depths in the West Indies, near 
Nova Scotia, and at the Philippines, by R. v. WiLLEMOfis-SuHM, Z. wiss. 
Zool. xxvi. p. liv. Also a note on a new genus intermediate between 
Echiurus and Thalassema, 1. c. pi. liii. 
Echiurus vulgaris, Sav., luetheni, Dies. ?, and Bonellia viridis, Rol.; 
this species occurs in Bergensfjord and Korsfjord., 50-100 fath. Koren 
& Danielssen (/. c. p. 137). 
In “ Marine Invertebrata of St. Andrew’s,” pi. iv. figs. 1 & 2, Priapulus 
caudatus and Echiurus vulgaris are figured from life. 
