302 Dr. N. AiinaiuLile on the 



Scafpellum Alcockianum, sp. n. 



Cop'itiihim oval, with or vitliont a notcli abnvc, with 13 

 plntc^, which are widely separated, embedded in and concealed 

 by a thick, brownish, externally corrugated and velvety mem- 

 brane. Carina simply bowed, its upper extremity not very 

 widely separated from or in contact with, but not entering 

 between, the terga, not or barely reaching carinal latera 

 below ; dorsal surface convex, without borders, decreasing 

 comparatively little from below upwards; sides straight; 

 umbo terminal. Terya irregularly quadrilateral, of moderate 

 size ; the apex not or very little superior to that of carina ; 

 carinal margin angular, receding from carina both above and 

 below, both portions feebly concave towards carina; scutal 

 margin excavated, but not strongly ; oecliideut margin 

 straight, forming a wide angle with the lateral margin of the 

 scuta. Scuta large, completely calcified, triangular, the apex 

 sometimes passing slightly in front of the lower extremity 

 of the oecludent margin of the terga, but not overlapping it. 

 Calcified portion of upper latus triangular, very small, widely 

 separated from other plates, its base convex towards the 

 carinal latus, its apex slightly retroverted towards the lateral 

 margin of the scutum. Rostral latus loug and narrow, its 

 main axis parallel to the basal margin of the scutum, from 

 which it is separated. Inframcdian latus triangular, the 

 margin directed towards the carinal shorter than that directed 

 towards the rostral latus, the base deeply embedded in the 

 membrane, the remainder of the plate curling outwards. 

 Carinal latus stout, irregularly triangular, not projecting far 

 behind the carina ; umbo subterminal, a small postumbinal 

 portion directed upwards and slightly retroverted; the bases 

 of the two latera meeting below the base of the carina. 



Peduncle short, cylindrical, expanded into a large flat disk 

 at base, armed M'ith tmnsversely elongated plates, which are 

 larger above than below and are ai'ranged above in alternating 

 and below in simple series; their number is variable ; a row 

 of minute slanting plates surrounds the basal disk. 



Appendages ^c. — Cirri long, curled at the tip, of a purplish- 

 black colour ; the first pair widely separated from the 

 second, with the posterior rami shorter by six joints than the 

 anterior. Anal appendages at least one thii'd, sometimes 

 more than one half, as long as the sixth cirri, slender and 

 tapering, with about thirty joints, i'aintly suffused with 

 purple. Penis slender and short, minutely aunulated, 

 covered with short hairs of a purplish colour. 



Mouth.— hahrum moderate. Maxillie large, with distal 



