Miscellaneous. | 427 
«983. Laprysta. Corpus repens, obvelatum membranis reflexis. 
** Clypeo dorsali, membranaceo, pulmones obtegente. 
“« Foramen laterale, dextrum, pro genitalibus. 
** Anus supra extremitatem dorsi. 
“ Tentacula quatuor, anterius sita. 
“depilans. 1. Laprysia. 
“* Syst. Nat. 10. p. 653. Tethys limacina, 
** Rond. pisc. 1. p. 520. Lepus marinus. 
“* Gesn. aquat. 475. Lepus marinus Rondeletii. 
“ Bohads. mar. 3. t. 1, 2, 3. Lernea graphice. 
“ Seb. mus. 3. t. 1, f. 8, 9, 
“* Habitat in M. Mediterraneo; sanie depilans tactu, 
“(B. 51.) foetidissima ad nauseam usque.” 
The description of the genus is implied for the species depilans, 
and it is also said to be the Tethys limacina of the tenth edition *. 
The second reference is to the same figuresof Rondelet formerly 
cited for Tethys leporina. The third reference repeats the earlier 
citation to Gesner, with the same mistake as to the page. The 
fourth reference is to the excellent figure of Bohadsch’s Lernea, 
representing unmistakably the Aplysia depilans of authors. The 
reference to Seba is less happy, the figures being too ambiguous for 
certain determination. It is perfectly evident that IJinnzeus’s 
generic characters of Laplysia were derived from Bohadsch’s work ; 
and as the best figures were from the same source, the traditional 
identification of depilans is fully sustained. 
Summary.—From the foregoing facts it would appear that (1) the 
generic name Vethys, Linn, 1758, must replace Aplysia and La- 
plysia, Linn. 1767 ; and (2) as a substitute for Tethys, Linn. 1767, 
not 1758, we will probably be compelled to adopt either one of the 
new spellings of this name proposed in the early part of the century 
or an entirely new generic term.—Proc. Acad. Nat. Sci. Philad. 
August 27, 1895, pp. 347-350. 
On the Origin of the Triradiate Spicules of Leucosolenia. 
By E. A. Mrncutry. 
In Leucosolenia coriacea the youngest spicules are found to be 
surrounded by six cells, which are similar in all their characters to 
the cells of the external flat epithelium of the sponge, and undoubt- 
edly derived from this layer. It appears that three cells of the 
external epithelium wander inwards, and give rise to six by division 
of each cell into two, the six cells being arranged in such a way 
that three are placed more internally, 2. ¢. towards the gastral 
sight, for the first use of the word, on page 1072 of the Syst. Nat. 12, is 
in the correct form “Aplysia.” The generic diagnosis given on this page 
is brief, but sufficient :—“ 283. Aplysia Tentacula4, Anus supra postica.” 
* We would not replace the specific name depilans by limacina, because 
the latter was not recognizably defined in Linnzeus’s earlier edition. 
