52 Frederick Chapman : 



Dimensions. — Lengtli, .73 mm.; width. ..'^65 mm.; thickness of 

 carapace, .29 mm. 



Affinities. — The above species differs from Dr. Brady's C. trun- 

 cata^ in having a depression in the median face of each valve, and 

 in the swollen and truncated posterior extremity in edge view. 



The allied C. truncata has been recorded from Torres Strait. 

 The present fossil species is from a Kalimnan (Lower Pliocene)- 

 horizon in both cases. 



Occurrence. — Bore 10, 225-230 feet (Kalimnan). Bore 11, 175- 

 197 feet (Kalimnan). 



Super-Order CIRRIPEDIA. 



Fam. LEPADIDAE. 



Genus SCALPELLUM, Leach. 



SCALPELLUM SUBQUADRATUM, sp. uov. (Plate X., Figs. 49^-0?; 



50 and 51«, b). 



Description. — Carina (holotype). — Elongate, strongly bowed in- 

 Avardly, with roof flat, gradually and evenly widening from apex 

 to base, and very slightly convex towards the basal margin ; surface 

 smooth except for faint growth-lines. Sides generally flat, thus 

 giving a square-sided appearance to the valve, and also showing 

 indications of a median groove. Basal margin broadly rounded. 

 Inner surface of valve deeply concave. Inner edge of carina crenu- 

 late near the apex, and cut through by short channels near the base. 



Another specimen (paratype), and probably the rostral latus, is 

 narrow, of slightly thinner build, and showing strongly arched 

 growth-lines along the length of the valve; inner surface concave 

 and smooth. 



Scutum (paratype). elongate triangular; occludent margin per- 

 fectly straight, basal, angularly rounded; tergal margin slightly 

 concave, with a nodulose edge. A longitudinal ridge runs from the 

 apex to the base, and close to the occludent margin. Superficial 

 growth-lines and shaded colour-patches very distinct. Inner sur- 

 face shoAvs the pit for the adductor scutorum, above which is a deep 

 fold running to the apex, and marked by some linear and sinuous 

 lines of growth. 



Dimensions. — Carina (liolotype), extreme apex wanting. Length, 

 20 mm.; width at tlie base, 4.5 mm.; thickness of carina near 

 apical end, 2.25 mm. 



1. Les Fondsde la Mer, 1868, p. 154, pi. xix., figs. 3, 4. Rep. Chall. Zool., vol. i., pt. ili., 1880,. 

 p. 174, pi. xxxvi., figs. Za-A. 



