28 Mr. W. H. Baily on a new Species of Solarium. 
with the remains of this and other individuals of the same 
species. 
EXPLANATION OF PLATE I., Figs. 1 a-1 1. 
Fig. 1 a. Pentacrinus Fisheri, natural size: 10, detached head of a 
larger specimen; 1c, plan of arrangement of ‘plates composing 
the calyx of a larger specimen (natural size), showing articulating 
surface of ramules; 1d, joints from the upper part of the column; 
le, part of ditto, enlarged; 1 f, articulating surface of ditto ; 
1g, portion of column, of still larger diameter, nat. size ; 1 h, part 
of ditto, enlarged; 1 i, articulating surface of ditto; 17, portion 
of the column, enlarged, showing Penertntt of the ramules arti- 
eulated to one of the joints; 1 k. two plates from the upper part 
of the rays, showing a double ridge; 1 /, one of the pinnules. 
VII.—On a new Species of Solarium from the Upper Greensand, 
near Dorchester. By W. H. Batty, F.G.S. 
Class MOLLUSCA. Order Gastzroropa. 
Fam. Littorinide. 
Solarium Binghami, Baily, n. sp. Pl. I. fig. 2 a. 
S. testa parva discoidea-depressa ; spira prope plana; anfractibus (6) 
clathratis, marginibus bicarinatis tuberculatis, umbilico magno 
profundo margine tuberculosa ornato; apertura angulosa. 
Diagnosis.—Shell small, discoidal ; spire nearly flat, consist- 
ing of six whorls, their margins bicarinated and ornamented 
with varices or tubercles; whorls decussated with longitudinal 
and transverse lines ; umbilicus large and deep, its margin being 
ornamented with a row of tubercles gradually decreasing in size ; 
mouth angular. . 
Dimensions.— Elevation 5%; inch; diameter +45. 
Affinities and Differences.—This pretty little Solarium differs 
specifically from all other described forms, being distinguished 
from S. moniliferum, Michelin, by its very depressed spire and 
large, deep umbilicus; and from S. albensis, D’Orbigny, by its 
depressed spire and reticulated sculpturing. Its nearest affinity, 
however, is with these, and more remotely with S. ornatum, 
Fitton,—all species from the Gault, the two former being from 
foreign localities, the latter a British species. 
Locality and Stratigraphical Range.—This beautifully pre- 
served specimen was collected from the Upper Greensand at 
Bingham’s Melcombe, near Dorchester, by the Rev. C. W. 
Bingham, a gentleman who has enriched the Museum of that 
town with many contributions, and to whom I have much plea- 
sure in dedicating it. 
EXPLANATION OF PLATE L., Figs. 2a-2c. 
Fig. 2 a. Side view of Solarium Binghami, natural size; 2 b, the same, 
magnified 3 diameters ; 2 ¢, upper surface of the same ; 2 d, under 
surface of the same. 
