36 
THE VOYAGE OF H.M.S. CHALLENGER 
7. Bornella hermanni, Angas ? 
Journ. de Conchyl., ser. 3, t. iv., 1864, p. 61, pi. vi. fig. 1. 
Pacific Ocean. 
8. Bornella semperi, Crosse ? 1 
Bergh, Malacolog. Untersuch., loc. cit., Heft, i., 1870, Taf. i. figs. 3-5. 
Philippine Sea. 
9. Bornella caledonica, Crosse ? 
Journ. de Conchyl., s6r. 3, t. xv., 1875, p. 318, pi. xii. fig. 10. 
Pacific Ocean. 
Bornella excepta, n. sp. (PI. VII. figs. 13-22; Pl. VIII. figs. 1-13). 
Color animalis ? 
Rhinophoria basi non appendiculata, parte posteriori (papillari) apice qnadrifida; 
papillae dorsales utrinque 5, infra branchiferae, apice bi- vel tri-fidae ; branchiae externae, 
appendiculatae, internae sine appendice. 
Dentes (linguae) mediani margine denticulato. Hamuli penis erecti. 
Habitat. — Pacific. 
One individual of this colossal species was taken in September 1874 in the Arafura 
Sea ; it had been treated with picro-sulphuric acid and preserved in alcohol, and was 
therefore in very good condition for study. 
Its length was 6 cm., height of the body proper 13 mm., and diameter 8 mm.; the 
height of the frontal papillae was 4‘5 mm., of the whole rhinophoria 11 mm., and of 
the anterior dorsal papillae quite 12 mm.; the breadth of the foot 5 mm. The colour 
was a clear brownish -yellow (owing no doubt partly to the picric acid) ; the liver was 
visible through the sides of the body, and on the right side the greenish-grey intestine 
also. 
The form of the body was quite as usual. It was stretched and somewhat compressed, 
broader above than below. The head (PI. VII. fig. 13) rather large, marked off from the 
1 The creation of this species is a good example of the “ species manufacturing ” of many writers. I myself, who 
have worked at the genus Bornella itself and the literature, found among the drawings of Semper a Bornella which is quite 
unrecognisable, and which therefore I quote as “ Bornella, sp., Semper MSS.” Crosse, who has no proper notion of the 
structure of Bornella, explains in an entirely worthless memoir (Note sur les genres Bornella et Placobranchus. Journ. cl. 
Concliyl., ser. 3, t. xv., 1875, pp. 322-325) this figure as a new species, Bornella semperi. His method of investigating such 
forms is also illustrated by the creation of another species, Bornella caledonica (Nudibr. de ia Nouvelle Caledonie, Journ. 
d. Conchyl., ser. 3, t. xv., 1875, p. 318, pl. xii. fig. 10). Writers of this kind are a burden to science, and Malacology has 
had enough of them. 
