iD THE NAUTILUS. 
trifles as that H. claviformis Martens 1897, was described and figured 
as H. elizabeth as long ago as May, 1889, from specimens taken at 
the same locality, or that species published from Mexico in 1896 are 
not mentioned. 
The peculiar group Epirobia Strebel is made a subgenus of Holo- 
spira. Whether this rank is or is not correct, may fairly be held a 
matter of opinion; but that von Martens errs radically in including 
all of the Mexican “ Cylindrella” in Epirobia is not a matter of 
opinion but of fact. The true Epirobia species have teeth consider- 
ably like Holospira correllated with a hollow shell axis (as in 
Holospira and Celocentrum); and here belong apiostoma, polygyra, 
polygyrella, and, perhaps, some others. Other continental species, 
such as bourguignatiana, morini, spelunce, subtilis, have the entirely 
different dentition of the slender Antillean species of Cylindredla, 
such as those of the Caribbean Islands, correllated with a solid shell 
axis, and unquestionably belong to a widely different genus. 
The only species left in “ Cylindrella” by von Martens is C. 
bourguignatiana Ancey, of which he says “unknown to me,” cur- 
iously forgetting to cite the figures of it published in 1891, although 
the paper which these figures illustrate is freely quoted in the earlier 
parts of the Biologia. Want of inclination as well as lack of space 
forbids allusion to numerous other infelicities in the text; and it isa 
pleasure to say that the plates are superb examples of lithography. 
It cannot but be a matter of serious regret to conchologists inter- 
ested in Mexican and Central American land snails that the later 
parts of this great work fail to sustain the high standard of the earlier, 
and that they fall short of what all have learned to expect from 
their brilliant and eminent author.—H. A. P. 
On THE Anatomy OF Apera Burnupi, E. A. Smiru, by Walter 
E. Collinge, (Ann. Mag. N. H., Aug., 1897). The detailed anatomy 
of this South African Testacelloid slug is prefaced by a reswmé of 
the history of the genus, which was originally established by Bin- 
ney under the preoccupied name Chlamydophorus. The pedal (sub- 
oral) gland, as usual in Agnatha,is very large. The genital system 
is rather simple, with very short vas deferens hardly differentiated 
from the slender penis, and the spermatheca is large and of peculiar 
form. The genus is held to be nearer to Testacel/a than to Schizo- 
glossa of the Rhytididee ; but while this is probably correct, it is 
difficult to form an estimate of its affinities without some knowledge 
of the muscular system, kidney, ete. 
