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Proceedings of Royal Society of Edinburgh. [sess. 
length than in C. craspedodiscus. Kitton believes that this 
“species,” founded on specimens procured by H.M.S. Challenger 
in the Arafura Sea, is identical with C. nobilis. The comparison of 
the markings with those of C. Janischii , var. arafurensis , Grun., 
appears to me to preclude this conclusion. In a letter to Mr E. 
Grove, dated May 8, 1888, Grunow states that C. arafusoenis , O’Me., 
is probably identical with C. Janischii , var. arafurensis , and this 
seems more likely. The name may he abandoned without incon- 
venience. No figure of the original was published. 
The specimen from Jeremie deposit, figured by Truan and Witt 
[Jeremie Diat ., p. 14, pi. ii. fig. 23), and referred to as Coscino- 
discus ? spec;, is pointed out as differing from Steph anophyxis turris 
by the absence of a circlet of apiculi. Grunow, however, enrolls some 
Franz Josefs Land valves without apiculi as vars. of the last named 
species, e.g., S. turns, var. cylindrus forma inermis [ Denk . Wien. 
Ak., 1884, p. 87, pi. v. (E), figs. 10, 11), and S. turris , var. arctica 
forma macrojpora , ibid., pi. v. (E), fig. 20. With this last, from the 
large size of its markings, the Jeremie valve seems to be identical. 
It also approaches Pyxidicula Weyprechtii, Grun., hut differs in not 
showing a gradual diminution in size of the markings outwards. 
The union of Adinocyclus alienus, Grun. (Van Heurck, Syn. Diat. 
Belg., pi. cxxv. figs. 10, 11), from Santa Monica; A. incertus, Grun. 
(Van Heurck, ibid., pi. cxxv. fig. 4), from Santa Monica and 
Monterey; A. subtilis, Ralfs [Pritch. Inf, p, 835; Van Heurck, 
ibid., pi. cxxiv. fig. 7 ; pi. cxxv. figs. 9, 11; Typ. Syn. Diat. Belg., 
Nos. 519, 520; Cleve and Moll., Diat., No. 171), from Ilfracombe, 
Plymouth, &c.; and A. Roperii, Grun. (Van Heurck, ibid., pi. cxxv. 
figs. 5, 6), from Carteret, &c., to Coscinodiscus, as proposed by 
Grun. [Denk. Wien. Ak., 1884, p. 83), is undesirable since in all a 
pseudo nodule is recognisable. 
Cl ovalis. Roper [Quart. Jour. Micr. Sci., 1858, p. 22, pi. iii. 
fig. 4), is Adinocyclus Roperii, Grun. (Van Heurck, Syn. Diat. 
Belg., pi. cxxv. figs. 5, 6), and synonymous with Eupodiscus Roperii, 
Breb. [Jour. Quek. Micr. Cl., 1870, p. 41). The name ovalis 
[Adinocyclus ovalis ), as being the older specific designation, should 
stand. Specimens were obtained by H.M.S. Challenger in a 
sounding made near Yedo, Japan. There is a true Coscinodiscus 
ovalis distinct from Roper’s form, and devoid of a pseudonodule. 
