266 SCIENTIFIC RESULTS OF THE 
This species may perhaps be the Triopa Carpenteri of Stearns; 
it has, like that, five branchial leaves, and does not differ much in 
the number of the dorsal appendices (six) or the form of the 
frontal margin; but the dorsal nodosities of the last species are 
orange-colored, and the rhinophoria, the dorsal appendices, and 
the branchial leaves tipped with orange. Through the great 
kindness of Mr. Dall I have seen a drawing of the animal of 
Stearns, from specimens secured after those he had described, 
but they do not give more details than the original description ; 
and Stearns seems not to possess the original specimens, which 
very likely are lost forever. On the other side, it must be remem- 
bered that Sars (Beretn. om en i Sommeren, 1849, foretagen 
zoolog. Reise i Lofoten og Finmarken, 1851, p. 74) found “ the 
young individuals of Triopa lacera (M.) entirely white, also on 
the tentacles and gills, merely the liver shines brownish through 
the skin.” 
EXPLANATION OF THE PLATES. 
An asterisk denotes that the drawing is by camera lucida, the 
fraction denotes the magnification. ‘ 
The serial numbers of the plates (Part I, plates i—vili, Part I], 
plates ix-xvi) are solely referred to throughout the text. As 
Part II appears in another volume of the Proceedings of the 
Academy, the plates of Part II have been for that reason renum- 
bered with a second set of numbers, Plate ix being Plate i, Plate x 
being Plate ii, ete.,in the new volume. The serial numbers re- 
ferred to in the text, follow the new numbers for Part II in 
parentheses throughout this explanation. 
~‘ 
PuatE I (1X). 
Jorunna Johnstoni (A. and H.). 
1. a, stalk of the (b) gangl. genitale; c, gangl. genit. secunda- 
rium,* 29%. 
. Granules of the back, stiffened by spicula,* 29°. 
Part of the middle of the radula, with the two innermost 
lateral plates; a, rhachis,* 27°. 
4. The hook of a plate from the back,* 2}, 
Ww bo 
. 
