220 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
If we are to infer from this description that T. pileopsis differs 
from Patella , not only in the presence of a cervical gill, but also in 
the absence of a branchial cordon, it may possibly be identified with 
Acmaea pileopsis Q. and G., although this species is recorded by 
Tryon as belonging to the New Zealand, Indo-Pacific and Austra¬ 
lian region, while Bernard (p. 217) states that his species came 
from Chili. 
Tectura fontainesi, however, is obviously incorrectly named, and 
is very probably a Scurria. I have not been able to find trace of 
any member of the family bearing this specific name. 
Bernard has also investigated Lottia pellucida, which he describes 
in the following terms (p. 225): “ Les Lottia ou Patina sont de 
petits Patellides depourvus de branchies proprement dites, mais 
munis de lamelles palleales et de tentacules lateraux.” This is 
obviously Patina pellucida Linn. I have found no justification for 
applying the name of Lottia to this genus. 
4. Von Erlanger, ’92, p. 604, describes the nephridia of an unde¬ 
termined species of Tectura (= Acmaea). 
5. Haller, ’94, describes four Acmaeidae : Scurria , two species 
of Lottia Gray, and Scutellina. If Dali’s classification of Scutel- 
lina be accepted, it is probable, as has been suggested by Thiele, 
that we have here to do with a case of incorrect determination. 
The description (pp. 26-27) shows clearly that the animal (sup¬ 
posing it to belong to a described genus of the Docoglossa) is an 
Acmaea. 
The two species of L^ottia Gray are also Acmaeas ; one lacks the 
branchial cordon altogether; the other has irregular outgrowths 
which Haller (p. 27) regards as the anlagen of the cyclobranch 
gills. They probably correspond with A. viridula Lam. and A. 
scutum Orb. 
6. Pelseneer, ’91, p. 61, describes the eye of Acmaea testu- 
dinalis. 
7. Thiele, ’92, p. 231, describes the structure of the mantle-edge 
in Collisella ( Acmaea) digitalis. Collisella is one of the sub¬ 
genera of Acmaea , and according to both German and American 
rules the subgeneric name, when required, should be placed in 
parenthesis and interpolated between generic and specific appella¬ 
tions. The name of Thiele’s species should therefore read Acmaea 
( Collisella) digitalis. 
8. Willcox, ’98, treats the general anatomy of Acmaea fragilis. 
