16 " ENDEAVOUR " SCIENTIFIC RESULTS. 



4 (3+4), in two instances only, 2 ; in the dry specimen the 

 distal margins of this series and the preceding are thickened 

 and shghtly flaring and there is Httle indication of synarthriai 

 tubercles, but in the alcohohc specimen while very slight 

 synarthriai tubercles are indicated the joints are all smooth 

 and indistinct. IVBr series, when present, 4 (3+4) ; not 

 present at all in the dry specimen, but four such series are 

 present in the alcoholic. Arms 40-44, terete ; brachials 

 soon become very markedly triangular, with thickened, 

 flaring, roughened distal margins, but distally they again 

 resume a quadrilateral form and the distal margins are not 

 peculiar. A syzygy occurs between 3 and 4 and then at a 

 variable distance of 8-16 segments ; after the second syzygy 

 there may be a second interval of 8-10 segments, but as a rule 

 syzygies become frequent and very regularly spaced, in one 

 specimen at intervals of 5 segments and in the other at 6 ; 

 that is, in one specimen each syzygial pair is followed by 3 

 normal segments and then another syzygial pair, while in the 

 other specimen, 4 normal segments intervene. 



Pinnules long and slender, especially the oral pinnules, of 

 which the first exceeds 30 mm. in length and consists of more 

 than 70 segments ; succeeding pinnules decreasing in length 

 to P4 which is only about 15 mm. long and contains only 20-25 

 segments. Comb of lowest pinnules consists of about 12-15 

 segments ; the combs persist as far as P4 on which the comb 

 consists of 7 or 8 segments. Basal segments of all pinnules, 

 except at very tip of arm, much wider than long ; on the 

 basal and middle portions of the arm, 3-12 of these widened 

 segments are conspicuous for their flaring, spinulose margins, 

 which are prolonged on the aboral side into remarkable 

 spinulose spurs ; these spurs are, of course, largest and most 

 fully formed on the basal segments (excepting the lowest two) 

 of the lowest pinnules ; passing distally along the arm, as 

 well as along each pinnule, these spurs become less and less 

 evident and finally disappear. Disk quite fully plated, 

 especially along the food-grooves ; the position of the mouth 

 cannot be determined in these specimens. Colour (of alco- 

 holic specimen) hght brown ; cirri somewhat fighter than 

 arms ; on drying, the colour becomes uniformly fight fawn or 

 very pale buff. 



This is a very well characterised and remarkable Comanthus, 

 related to C. bennetti and C. pinguis, but easily distinguished 

 from either, by the curious pinnule segments. The small 

 number of arms and the colour will further distinguish it 

 from C. bennetti, while the shape of the arms, especially at 



