56 Moll 
MOLLUSCA. 
tence of the male organ, and the presence or absence of an occasional 
gland in it, in six groups, which do not wholly correspond to the groups 
made with regard to the modifications of the eyes ; Reis. Philippin. iii. 
supplem. pp. 39 & 40. He states also that the geographical distribution 
of the species provided with dorsal eyes coincides with that of the genus 
Periophthalmus (fish), and supposes that those eyes serve to perceive the 
approach of this enemy, in which case the animal will defend itself by 
rapidly expelling many drops of slime ; 1. c. pp. 31 & 32. 
Onchidella (Gray), distinguished by the respiratory orifices being 
placed on the right side of the vent and the male orifice on the right side 
of the tentacles ; whereas in Onchidium both are in the median line, the 
former behind the vent, the latter behind the tentacles ; no dorsal eyes. 
Semper, 1. c. p. 40. 
Vaginulid^e. 
Vaginula (Pdr.). O. Fischer gives a general account of the genus, enu- 
merating the known species, and describing as now V. brevis^ Zanzibar, 
7naillardi, Bourbon, seychcllensis, Seychelles, and gayi^ Valdivia ; ho also 
gives figures of V. sloanii (F4r.), occidentalis (Guilding), moreleti (Crosse 
& Fisch.), seychellensiSf sp. n., and plebiea (Fisch.), drawn from living 
specimens, with jaw and radula of the last. N. Arch. Mus. vii. pp. 
147-175, pi. xi. figs. 1-12. 
Vaginula occidentalis (Guilding). Anatomical figures by Crosse & 
Fischer, Moll. terr. et fluv. de Mexique, pt. 6, pi. xxviii. figs. 21-26. F. 
moreletiy sp. n., Uving animal figured, pt. 5, ph xxiv. fig. 14. 
Agnatha (Testacellidjj). 
A general description of this family and list of the known genera 
(Streptaxis and Ennea not included), by Strebel, Moxik. Land- u. Siissw. 
Conch, iii. pp. 3-7. A small median tooth in the radula was found in 
almost all the species examined. 
Daudebardia heldi (Clessin), Bavaria, nivalis (Benoit), Sicily, sicula 
(Benoit), Sicily, langi (Pfr.), Hungary, and transylvanica (Bielz), Trans- 
sylvania ; Kobelt, Iconogr, v. pp. 79-84, pi. cxli. figs. 1388-1390, 1396 & 
1397. The Algerian species copied from Bourguignat, 1. c. figs. 1391-1395. 
MMrchia concolor (For., us lldix). Embryonal shells and radula 
described, the latter without median tooth j Martens, JB. mal. Ges. 
pp. 344 & 345. 
Strebelia berendti (Pfr.). Its anatomy given and its systematic place 
among the Testacellidce confirmed by H. Strebel, Mexik. Land- u. Siissw. 
Conch, iii. pp. 9 & 10, pis. i. & ii. 
Glandina. H. Strebel admits Varicella^ Oleacina^ s. str., and a special 
section for the European species, G. algira (Brug.), as subgenerically 
distinct from Glandina^ s. str., giving a full description of the living 
animal, habits and anatomy of Q. sowerbiana (Pfr.), pp. 35-44, and 
anatomical notes on confer ta (Pfr.), amcena (Martens), coronata (Pfr.), 
uhdeana (Martens), and liehmanni (Pfr.), and 2 new species j Mexik. 
