246 JOURNAL OP CONCHOLOGY, VOL. II, NO. 8, OCTOBER, I905. 



pallescens, Chr. mornata and probably many others which are im- 

 perfectly described belong to this group. 



Chromodoris semperi Bergh. 



var. nigrostriata ^ Chr. nigrostriata Eliot, 

 var. tenuiliftearis = Chr. tenuilinearis Farran. 



Bergh, "Mai. Untersuch.," Semper' s Reiseii, xi., pp. 482-484; Eliot, 

 "Nudibranchs from E. Africa and Zanzibar, lY. " Froc. ZooL Soc. 

 1904, vol. I, pp. 394-395 ; Farran, "Opisthobranchiate MoUusca," 

 Ceylon Pearl Oyster Report., p. 342, 1905. 



In describing Chr. nigrostriata, I hinted that it might prove to be 

 a mere variety of Chr. semperi., in spite of some marked differences of 

 coloration, and the present series of specimens seems to show that the 

 two forms pass into one another and cannot be satisfactorily separated. 



One specimen from Karachi is described as follows in the notes 

 on the living animal : " Semi-transparent, slatey-greyish flesh colour 

 with bright orange spots, and irregular spots and streaks of deep 

 purple, almost black. The spots on the tail end are much clearer 

 than those on the fore end. The upper part of the body is darker 

 and brighter than the lower part. The six points {i.e., branchiae, 

 as is shown by a rough sketch) are marked very prettily with a row of 

 orange spots and an alignment of dark purple." These colours are 

 still fairly well kept in the preserved specimen. The ground colour 

 is greyish, marked with fine black lines, which are often broken up 

 into short streaks or dots, especially on the sides of the body and 

 behind the rhino])hores. The back and sides are covered with dull 

 yellow spots which are specially thick near the branchiae and on the 

 tail. The central part of the back, between the rhinophores and 

 branchiae, is darker than the next and almost black. 



Length 21.5 mm., niaximum breadth 7 mm., height 6.5 mm. The 

 shape is high and fairly stout. The texture is quite smooth and soft. 



The foot is narrow, grooved, and expanded in front with tentacular 

 angles. The tail projects behind. The mantle margin is very narrow 

 and bears no visible glands or projections. The oral tentacles are ■ 

 longish and digitate. The pockets of the rhinophores and branchiae 

 are only very slightly prominent. The branchiae are six, simply 

 pinnate. They bear an extremely elegant pattern, composed of two 

 fine black lines between which is a row of yellow dots, on the outside, 

 and of a single black line on the inside, at the bottom of which still 

 remains a bright yellow spot. 



The buccal mass is large, and the salivary glands long. The labial 

 armature is a complete and fiiirly strong yellow ring, composed of 

 short, thick, mace-like hooks. There are distinct prominences on 

 each side of the main hook. I'he yellow radula consists of 85 rows, 



