239 
the others are rather uniformly developed. Some scanty, fine hairs 
are seen on the outer part of the maxilla. 
In the cirrus I the branches are unequal, the anterior ramus 
short, with 6 segments, and twice as broad as the posterior ramus 
which has 8 segments; the basal segment of the posterior ramus 
is very long, and evidently consists of two or three concrete seg¬ 
ments. Cirrus II to VI have all but the same size; their rami 
have about 13 segments each. 
The caudal appendages are short, only consisting of the basal 
segment (Fig. 7 d.); they are rounded, with two or three short, 
spinelike hairs along the dorsal side, and four hairs distally. 
There is no trace of a penis in the animals dissected. 
Small oval males are present in the specimens; they display the 
most reduced type without any trace of skeleton. 
Among the specimens from the Strait of Georgia three very 
small individuals were found; two are represented in fig. 7 b. and 
c. the third one representing the same stage as the younger of 
those figured. A comparison with parallel stages of Scalpellum 
Stromii (vide Broch 1912) reveal interesting features of concord- 
ance, and of differences. 
The youngest stage shows us that in Scalpellum gruvelianum 
as in Scalpellum Stromii the superior latus makes its appearance 
at a very early stage, and the relative size of the plates indicates 
that also here the two lower pairs of peduncular scales appear be- 
fore the lower latera. In Scalpellum gruvelianum the carinal latus 
is the first of the lower latera, which makes its appearance at the 
transition from peduncle to capitulum, immediately followed by the 
inframedium, and then also by the rostral latus. In Scalpellum 
Stromii , on the contrary, the first plate developed of this row, 
is the rostrum. The latter plate is rudimentary or absent in Scal¬ 
pellum gruvelianum ; herein my specimens confirm Pilsbry’s state- 
ments (1907); the rostrum may be indicated as a small nodule 
hardly as large as a scale of the peduncle, or it may be totally 
absent in the adult. — The other latera are, on the other hånd, 
parallelly developed in both species. 
The somewhat older specimen has a small rostrum. This spec- 
imen shows us that the same rule holds good in Scalpellum gru- 
