REPORT ON THE NUDIBRANCHIATA. 
91 
developed and four undeveloped rows, so that their total number amounted to twenty- 
seven. The first five (outer) rows were incomplete ; in the first complete row, the sixth, there 
were thirty- three plates (on either side), and the number hardly increased towards the 
hack. The plates were very pale yellow ; the height of the five outermost plates (fig. 18) 
was '08-T-T2— T4-T8 mm. ; the height then gradually increased, sometimes reaching 
•25 mm., and again diminishing from the middle of the row inwards, and decreasing 
to about T2 mm. (fig. 16). The form was as usual, the two outermost much more 
slender (fig. 18, a, a). 
The salivary glands yellowish, elongate, bent at the middle and again ascending on 
the posterior end of the bulbus pharyngeus. 
The oesophagus nearly 3‘5 mm. long, with strong longitudinal folds on the inside. 
The stomach, which projects out of the fissure of the liver, is large, nearly 3 - 5 mm. long 
by 2 - 75 mm. broad and 1*4 mm. high. The intestine opens from its anterior end, and 
runs almost straight backwards; it is nearly 12 mm. long, and ‘75 mm. broad almost 
throughout ; the inside shows the usual longitudinal folds. The whitish, soft contents 
of the digestive cavity were a mass of indeterminable animal remains. 
The liver is nearly 7 mm. long, by 5 mm. broad and 4 ‘7 5 mm. high, shaped like a 
short cone ; the hollowed anterior end with a small facet below (for the anterior genital 
mass) ; the outside colour grey, the substance yellowish. The hepatic cavity is tolerably 
wide with the usual crypts. The gall-bladder lies to the right below the stomach, a 
yellowish-white, elongate pyriform sac, nearly 1*75 mm. long, and measuring '75 mm. 
in diameter at the bottom. 
The pericardium and the heart as usual. The blood glands joined by a short neck 
on the upper side of the central nervous system, greyish-yellowish ; flattened, especially 
the anterior gland; they were almost of equal size and quadrangular with rounded angles in 
outline, their largest diameter nearly 1*5 mm. — The yellowish renal syrinx melon-shaped; 
the urinary chamber narrow ; the kidney, with a beautiful dendritic ramification, covering 
the whole upper side of the posterior visceral mass (PI. II. fig. 13). 
The grey hermaphrodite gland contrasts with the yellowish liver, which it covers as 
a thin layer ; the small lobes without developed reproductive elements. The yellowish- 
white anterior genital mass wms undeveloped, nearly 1*2 mm. long, and as much as 
0'8 mm. broad and high. The ampulla of the duct of the hermaphrodite gland was 
somewhat short and thin. The spermatheca spherical; the spermatocyst sac-shaped, 
longer than the spermatheca. 
This species appears to be distinct from the preceding, as is shown even by the 
form and the nature of the gill. They are both specifically distinct from Archidoris 
montereyensis . 1 
1 Bergh, On the Nudibr. Gastr. Moll., &c., I., loc. cit., pp. 107 (163), pi. xvi. figs. 10, 11. 
