REPOET ON THE PTEROPODA. 
99 
Krohn 1 collected in tlie Atlantic, off Tenerife, some larval forms of Cymbulia, but as the 
adults were not observed, it is not known whether they belong to the present species 
or not. 
Observations . — I. Cymbulia quadripunctata, Gegenbaur, is not an adult form. I 
have no hesitation in describing it as a young Cymbulia peroni, for I have observed at 
Naples, among young forms of Cymbulia entirely like one another, an individual with 
purple spots on the fins as in Gegenbaur’s species ; but the presence of these spots is no 
specific distinction. 
II. It is uncertain whether the Cymbulia of the Indian Ocean figured by Macdonald 
is identical with Cymbulia peroni. It is distinguished especially by the much longer 
dorsal portion and by the straight contours. 
2. Cymbulia parvidentata, n. sp. (PI. II. figs. 12, 13). 
Characters and Description. — Shell slender, proportionally narrower and more 
elongated than the above, and exhibiting a constriction towards the middle of its length, 
the dorsal portion long and pointed, the spines on the surface of small size and very 
uniform even on the borders of the aperture, where they are very large and distinct in 
Cymbulia peroni. The two rows of spines which end in the ventral points exhibit at 
their middle a re-entrant angle corresponding to the constriction of the shell. The cavity 
of the latter is very narrow and of little depth. 
Animal unknown. 
Dimensions. — Smaller than the preceding species, the shell 3*5 cm. in length. 
Habitat. — Cook Strait, New Zealand (the type specimen is in the British Museum). 
# 3. Cymbulia sp. (?). 
A specimen of a Cymbulia, without its shell, with the fin as in Cymbulia peroni, that 
is to say, bearing a ventral lobe ending in a whip. As the specimen was stained and 
mounted in balsam, it is difficult to give any detailed description. I shall not bestow 
on it any specific title. It is possible that it belongs to the above species, in which the 
animal is still unknown, both forms occurring in the Pacific Ocean. 
Challenger Specimen. — Station 254, July 17, 1875 ; Yokohama to Sandwich Islands; 
lat. 35° 13' N., long. 154° 43' W. 
Embryonic shells of Cymbulia (PI. II. fig. 14) have been collected at the following 
locality : — 
Station 216a, February 16, 1875 ; north of New Guinea; lat. 2° 56' N., long. 
34° 1-1' E. 
1 Beitrage zur Entwickelungsgeschichte der Pteropoden und Heteropoden, p. 19. 
