564 PROF. C. H. O'DONOGHUE : KErOKT ON 
The type-specimen described by Abraham (2) measured 56 mm. long by 
44 mm. broad and 16 mm. high, so that it was not so large as the present 
one. No locality is given, but it is stated to be " obtained during the 
Antarctic Expedition." It was possibly obtained at some port of call, how- 
ever, for the Dendrodorids as a genus are characteristic o£ the warmer seas. 
Family EUPHIJRIDiE (Polyceeidjs, Polyceead^). 
The bod}' is more or less elongated and limaciform. The dorsum is not 
marked off from the sides or separated by a prominent margin. The frontal 
veil is more or less prominent, simple, or furnished with simple or compound 
appendages, and the dorsum generally has a solitary dorsal appendage 
(brancliialis) or several dorsal and lateral. The branchise are generally 
paucifoliate, but may be composite ; they are not retractile within a cavity. 
The tentacles are small, lobiform, folded, or auriform. The foot is not broad, 
and generally rounded anteriorly. The bulbus pharyngeus is simple. The 
buccal cavity is often armed with laminte (often composed of minute rods). 
The radula nearly alwa}s has no rachidial teeth ; the majority of the pleural 
teeth are uncinate, and the outermost teeth simple, not hamate. The glans 
penis is armed ; two spermathecas are jDresent. 
In 1798 Cuvier instituted the name Tritonia for a genus of Nudibranchs, 
but while describing the genus he mentioned no particular species, and later, 
in 1803, he enlarged this description and dealt with a definite and new 
species, T. homhergii. Lamarck in 1801 took Cuvier's name and gave as a 
species of the genus T. davigera. Rafinesque in 1815 proposed the name 
Euphurus for the Tritonia of Lamarck — i. e., with T. davigera as a type. At 
a later date Johnston (1838) dismissed Lamarck's species as being outside 
the limits of Cuvier's genus, and proposed for it the name Triopa davigera, 
under which it has since been dealt with. To turn to other animals than 
Nudibranchs, however, we find that in 1774 Tritonium was employed as a 
generic name by Miiller, and in 1800 Meigen used Tritonia as the name 
of a genus. 
Thus it will be seen that the term Tritonia as applied to Nudibranchs 
refers to two entirely different and unrelated forms, and in any case the 
name is pre-occupied. As noted previously, Tritonia Cuvier [i.e., with 
T. homhergii as type) has to be replaced by Splimrostoma Macgillivray, and 
as will be seen above Tritonia Lamarck («', e., with T'. davigera as type) 
becomes Euphurus Rafinesque. and this intercepts the later name Triopa 
Johnston. In this way the oldest generic name in the present family 
becomes Euplmrvs, from which the family-name is dei-ived. This matter 
is also referred to by Iredale (51) and Iredale and O'Donoghue (51a). 
Genus Notodoris Bergh, Journ. Mus. Godeffroy, viii. 1875, p. 64. 
Type by monotypy : i\^. dtiina Bergh, I. c. 
The body is limaciform with the sides not marked off from the dorsum ; 
it is hard and rough, often marked with prominent ridges. The frontal veil 
