SIPUNCULOIDEA, 
WITH AN ACCOUNT OF A NEW GENUS LITHACROSIPHON. 
By A. E. Suretey, M.A., Fellow and Tutor of Christ's College, Cambridge, and 
University Lecturer in the Advanced Morphology of the Invertebrata. 
(With Plate VIL) 
THE collection of Sipunculoidea brought back from the Maldive and Laccadive Islands 
by Mr J. Stanley Gardiner’s Expedition was a rich one. It comprised the following nineteen 
species belonging to six different genera, one of which I take to be new, and many species 
were represented by numerous specimens :—Aspidosiphon steenstrupii Dies., A. truncatus Kef., 
Cloeosiphon aspergillum Quatrefages, Lithacrosiphon maldivense, u. sp., Phascolosoma dissors 
Sel. and de Man, Phas. lobostomum Grube, Physcosoma agassizii Kef. Phys. asser Sel. and 
de Man, Phys. dentigerum Sel. and de Man, Phys. lactewm Sluit., Phys. nigrescens Kef., Phys. 
pacificwum Kef., Phys. pelma Sel. and de Man, Phys. riippellii Grube, Phys. scolops Sel. and 
de Man, Sipunculus billitonensis Sluit., S. cumanensis Kef., S. indicus Peters, S. vastus Sel. and 
Biilow. Of these species all but five, A. truncatus, Lith. maldivense, Phascolosoma lobostomum, 
Physcosoma lacteum and Phys. nigrescens, were found at Minikoi in the Laccadives and all 
but four, Phas. dissors, Physcosoma dentigerwm, Phys. pelma, and S. billitonensis, were found 
in the Maldives. Thus ten species were common to the two groups of islands. 
On the whole the collection bears out the remarks made on the occurrence and 
distribution of the members of the group in Willey’s Zoological Results, Part 11. 1899, 
p- 151 and at the end of my paper “On a new species of Phymosoma, ete.” in Quarterly 
Journal of Microscopical Science, XXx1t. 1891. 
The account of the new genus will be found at the end of this memoir, 
In the following notes on the several species I have not attempted a complete 
bibliography, but I have mentioned the latest paper available in which the species in 
question is dealt with. The abbreviations are in all cases those suggested by Dr Sharp 
in the Zoological Record. 
I. SYSTEMATIC ACCOUNT. 
I. Genus ASPIDOSIPHON Grube. 
1, Aspidosiphon steenstrupw Dies. 
Shipley. Willey’s Zoological Results, Part 11. 1899, p. 153. 
Many specimens found by breaking up the coral and stone masses. The specimens 
varied a good deal in size; the larger examples had the characteristic chalky deposit on 
the anterior shield. 
