1880.] NATURAL SCIENCES OF PHILADELPUIA. 47 



one for the penis, which is armed with a stylus ; another for a hasta 

 amatoria, through which opens a peculiar gland (quite as in the genus 

 Asteronotus) ;i a third for the vagina, and the fourth for the duct of 

 the mucous gland. 



Only one species of the genus seems hitherto known, belonging to 

 the northern part of the Atlantic Ocean. The spawn of the species 

 is known from Alder and Hancock, but nothing else is known of the 

 biology of the animal. 



1. J. Johnstoni (A. et H.). 



Doris Johnstoni, A. et H. Oceauum Atlantic, septentr. 



Jorunna Johnstoni (A. et H.). Plate VIII, fig. 19 ; Plate IX, fig. l-ll. 



Doris Johnstoni, Alder et Hanc. Monogr. Part I, 1845, fam. 1, PI. .5 ; Part 



V, 1851, fam. 1, PI. 2. f. 8-11. 

 Doris Johnstoni, Hanc. et Embleton, Anat. of Doris. Philos. Trans. 1853, 



II, p. 212, 215, 216, 220, 233, PI. XII, f. 2, 10 ; PI. XIV, f. 9, 10 ; 



PI. XV, f. 1-2 ; pi. XVII, f. 2-3. 

 Doris Johnstoni, Forbes and Hanley, Hist, of Br. Moll., Ill, 1853, p. 564. 

 .' Doris tomentosa, Cuv., Fischer. Jouru. de Conchyl., 3me Ser., x, 1870, 



p. 290 293 ; XV, 1875, p. 211, note. 

 .' Doris tomentosa, C. Verany, catalogo. 1846, p. 16-21. Ver., Hanc. et 



Embleton, 1. c. 1852, p. 220.'^ 

 ? Doris tomentosa, C. Philippi, En. Moll. Sic. I., 183, p. 104 ; II, 1844, p. 



79, Tab. XIX, f. 9. 



Color flavescens, dorso interdum maculis fuscis seriatis ornatus ; 

 rhinophoria fusco-maculata ; branchia albescens. 

 Hab. Oceanum Atlanticum septentr. 



This species, that was first described by Johnston under the name 

 of D. ohvelata (Miiller), was (1845) established by Alder and Han- 

 cock. Hancock gave a series of anatomical remarks upon this very 

 interesting form and of figures referable to it. Since then nothing 

 new seems to have been published about the species ; but a few months 

 ago I (1. 0.) gave a short notice of the generic characters of the 

 group. 



Of this form I have only examined a single specimen, captured in 

 March, 1870, in the neighborhood of Hellebak, on the north coast of 

 Seeland (Denmark). 



^ R. Bergh, Ueber das Geschlecbt Asteronotus, Ehrbg. Jahrb. der Deut- 

 scheu Malakozool. Ges., iv, 1877, p. 161-173, Taf. I-II. 



•^ According to Hancock and Embleton (1. c, p. 220), the dart (hasta 

 amatoria) in Doris Johnstoni is straight, in D. tomentosa, Ver., curved. 



