524 
THE YOYAGE OF H.M.S. CHALLENGER. 
Frondicularia millettii, n. sp. (woodcut, fig. 16, a.b.). 
Test elongate, tapering, compressed ; oral end broad and rounded, aboral extremity 
obtusely pointed ; lateral faces concave ; peripheral edges thick and rounded, and 
ornamented with numerous, raised, parallel, longitudinal costae ; 
aperture a simple, circular, bordered orifice. Segments about 
ten in number ; sutures marked by very slight depressions. 
Length, T yth inch (0'36 mm.) or more. 
This beautiful little shell appears almost equally related to 
Frondicularia and Lingulina, and in the absence of any more 
distinctive feature, the shape of the aperture has suggested its 
nearer affinity to the former genus. The concave faces and thick, 
round, costate edges are sufficient for its easy identification. 
The specimen from which the woodcut has been drawn 
was sent to me by my friend Mr. F. W. Millett, by whom 
it was obtained from the coral-sand dredged at Station 185, 
off Eaine Island, 155 fathoms; and I have much pleasure in 
associating his name with the species. 
Khabdogonium, Reuss. 
Vaginulina , pars, d’Orbigny [1826], Parker, Jones, and Brady. 
Orthocerina, pars, d’Orbigny [1839], Carpenter, Blake, Biitscbli. 
Triplasia, Reuss [1854], Costa. 
Rhabclogonium, Reuss [1860], Karrer, Giimbel, Hantken, Terquem, Schwager, Brady. 
The genus Orthocerina was included by d’Orbigny in the “ Tableau Methodique,” 1 and 
characterised by the possession of a straight conical test having cylindrical tapering 
chambers, but without any terminal prolongation for the aperture, that is to say, with an 
orifice situated on the truncate or convex face of the final segment. The genus was 
then limited to a single species, Nodosaria ( Orthocerina ) clavulus , a fossil from the Paris 
Tertiaries, and upon this Modele No. 2 is founded. The particular form intended to be 
represented by the model in question cannot now be identified, unless, as suggested by 
Parker and Jones, it is one of the Tertiary Clavulince which has lost its valvular tongue 
— an explanation that appears in every way probable. 
In 1839 (Foram. Cuba, p. 47), a four-sided species, Orthocerina quadrilaterci, was 
added to the genus, and the distinctive characters were modified so far as to include 
angular as well as cylindrical varieties, the terms referring to the aperture being retained 
without alteration; and the same description was repeated in 1846, in the “ Vienna 
Basin ” monograph. 
1 In the first instance the term was employed in a subgeneric sense for the 4th section of the Nodosaricv, 
a. b. 
Fig. 16 — Frondicularia, mil- 
lettii, n. sp. ; magnified 
120 diameters. 
a. Side view. 
b. End view, showing the 
aperture. 
