PART 5 



A MONOGRAPH OF THE EXISTING CRINOIDS 



567 



a 



c 



mm 



FIGURE 32. Ltptometra phalangium (]. Muller): a, Longest cirrus segments of two different 

 specimens and a segment from two-thirds of the length from the base of one; b, cirrus tip. 

 L. celtica (Barrett and McAndrew):f, Longest segments and two from two-thirds of the length; 

 d, tips of cirri of three specimens, the two on the left from a single specimen, the one on the 

 inside being a more apical cirrus; e and /, centrodorsals of two specimens from SW. Ireland, 

 B.M., 1912.8.20.7-10; g, centrodorsal of specimen from the Minch, B.M., 98.5.4.998-1000; 

 proximal part of PI. 



in celtica. But, he says, there is & considerable amount of variation in this respect, 

 even in individual arms. 



Notes. Carpenter says that the long segmented cirri characteristic of phalangium 

 are the prevailing kind in the specimens dredged off Cape Sagres and off Mondego by 

 the Porcupine; but that, in those dredged by the Dacia on the Seine Bank, this type is 

 very largely intermixed with another, the terminal segments of which are rather 

 short and broad, somewhat as in those of the Ross-shire variety. Besides the more 

 or less long segmented cirri typical of phalangium, the specimens dredged by the Dacia 

 on the Seme Bank bore a number of cirri much more like those characteristic of the 

 Ross-shire form. One of these cirri has 57 [surely a mistake for 51] segments which 

 gradually decrease in length from the middle of the cirrus onward, and the short later 

 ones are somewhat compressed laterally, but about as broad as long. In this cirrus 

 there are dorsal spines on both the segments preceding the terminal claw, while in 

 another there is a third spine on the segment preceding these. The relative shortness 

 of the segments in the outer third of the cirri is very marked in all these specimens. 

 This "square-jointed" type of cirrus, according to Carpeirter, is the most common one 

 found in the Scottish specimens. 



Of a specimen from the Brazilian cable in Funchal Bay, Madeira, Carpenter says 

 that it is generally similar to those obtained by the Dacia on the Seine Bank in 161 

 meters, excepting for the extreme shortness of the later cirrus segments. Carpenter 



