ECHINODERMATA. 161 
ForBES gives the name of Syrinxw to the species which have a short 
proboscis with an indented tentacular fold around the mouth, like Stpune. 
nudus. In other species the proboscis is longer, and there is a ring of 
simple lancet-shaped tentacles round the mouth. Of these he forms his 
genus Stipunculus, which appears to agree with Phascolosoma LEUCK. 
Sp. Phascolosoma granulatum Leuck. |. 1. fig. 5, from the Mediterranean, 
probably not different from Ascosoma Blumenbachii, ibid. fig. 5; Sipunculus 
capitatus RATHKE, Nov. Act. Acad. Leop. Car. xx. 1, Tab. vi. fig. 20, 21; 
Sip. Bernhardus Fors. Brit. Starf. p. 251; it lives, like the Hermit Crab, 
in the empty shells of Molluses (Strombus pes pelecani, Littorina, Turritella, 
Dentalium, &c.) 
Priapulus Lam. Body cylindrical truncated posteriorly. Pro- 
boscis retractile; no tentacles around the mouth. A branched 
pyramidal appendage hanging from the posterior part. 
Sp. Priapulus caudatus, Holothuria priapus L., Zool. danica, Tab. Xcvi. 
fig. 1, and oxxxv. fig. 2, Forses Brit. Starf. p.256. GusRrin Jconogr. 
Zooph. Pl. 5, fig. 1. It is supposed that the bundle of threads at the 
extremity of the body serves for respiration. This singular animal lives in 
the North Sea. 
Bonellia Rotanpo. Body oval, contractile, with a long pro- 
tensile proboscis, divided at the extremity into two lacinie. Anus 
posterior, terminal. 
See RoLanpo in Jowrn. de Physique, de Chim., d’ Hist. nat. &c. Tom. 
xcy. Juillet, 1822, pp. 49, 59, av. fig. (from the Mém. de Acad. de Turin, 
Tom. XXVI. pp. 357, &c., Tab. xIv. xv.) The long proboscis was taken for 
a tail by this writer, the anus described as mouth; near the anus two 
trussed organs are situated (salivary organs according to ROLANDO), which 
correspond to the arborescent respiratory organs of Holothurie. The 
intestinal canal is narrow and long, with two loops and many undulations. 
Sp. Bonellia viridis 1.1. fig. 1, Guirin Iconogr. Zooph. Pl. 6, fig. 1; Bon. 
fuliginosa. These two species were found by Rouanpo on the shore of 
Sardinia. 
Thalassema Cuv. Body cylindrical contractile. Proboscis short, 
with Spoon-shaped appendage, or sulcated lacinia, undivided. Two 
shining uncinate sete in the anterior part of the body, behind the 
proboscis. 
* Body smooth posteriorly. Thalassema GAERTNER. 
Sp. Thalassema Neptunt GAERIN., PALL., Spicil. Zool. x. Tab. 1. f.6, Guerin 
Iconogr. Zooph. P. 6, fig. 2, Forbes Brit. Starf. p. 259. (Here also seems 
to belong the genus Ochetostoma LEucK., Sp. Ochet. erythrogrammon, Atlas 
zu der Reise VON Ep, Ruppetn, Neue wirbellose Thiere des rothen Meeres, 
1828, Tab. 1. fig. 3, Holoth. eaowart Less. Cent. Zool. and GuéR. Iconogr. 
Zooph, Pl. 4, fig. 6. 
VOR I. 11 
