A MONOGRAPH OF THE EXISTING CRINOIDS 297 



CRINOMETRA BREVIPINNA var. PULCHELLA. var. nor. 



Antedon brevipinna var. pulchra (not Crinometra pulchra A. H. Clark, 1909) HARTLAUB, Mem. Mus. 

 Comp. Zool., vol. 27, No. 4, 1912, p. 322 (in key), p. 329 (description; no locality; Blake). 



Description. Hartlaub regarded a very large specimen with rather slender and 

 laterally compressed arms reaching about 150 mm. in length as a representative of a 

 special variety. Unfortunately there was no locality label with it. 



This variety differs from var. gracilis externally by its stouter habitus and the 

 dark color of its centrodorsal which in places is almost black, and by the exceptionally 

 light cirri and division series. The upper border of this dark color is very different on 

 the several postradial series. 



The form of the centrodorsal resembles that described for var. insculpta (decora). 

 So does the ornamentation, which is composed of fine pointed protuberances coalesced 

 into lamellae on the dorsal pole and on the sides of the centrodorsal. In contrast to 

 var. insculpta and var. gracilis, these are confined to the centrodorsal. 



The cirri are XXIV, all broken off beyond a few basal segments. 



The ornamentation of the ossicles of the division series consists of uniformly large 

 usually blunt tubercles which, closely placed and occasionally coalescing, rather uni- 

 formly cover the ossicles. Only very exceptionally is there a larger median tubercle 

 or a median ridge. In contrast to var. insculpta the proximal, distal, and lateral borders 

 of the segments are not distinguished by special ornamentation. On the surface of the 

 ossicles of the IIIBr series and first four brachials there is found, in contrast to var. 

 insculpta, a broader shield-shaped swelling or tubercle, besides which there are the 

 small tubercles of the type found on the IBr and IIBr series. These last generally end 

 at the fourth brachial. The radials are not visible. All the IIBr series are 2 and, like 

 the IBr series, are flat. All the axillaries are rhombic. There is one IIIBr 2 series. 



There are 21 arms. The ornamentation of the brachials from the third outward to 

 about the tenth differs from that characteristic of var. insculpta and var. gracilis in 

 that a larger, smoother, and approximately quadrangular tubercle or swelling arises 

 from the lower edge of the swollen distal border of the brachials in the middle of their 

 dorsal surface. As far as about the tenth brachial the form of the rather flat ossicles 

 is rectangular with transverse articulations. After the tenth the brachials assume a 

 more diagonal direction, the brachials rather suddenly becoming approximately tri- 

 angular and longer and at the same time developing a liplike ornamentation, the median 

 tubercles disappearing and the produced and slightly crenulate or tubercular distal 

 edge being turned downward in the middle. 



In contrast to var. insculpta and var. gracilis, there is never a syzygy between 

 brachials 1 + 2. The first syzygy is usually between brachials 3 + 4, very rarely 

 between brachials 4 + 5. In the two arms arising from the IIIBr series the first 

 syzygy is between brachials 18+19 and 27+28. The syzygy between brachials 3 + 4 

 is followed very rarely by one between brachials 6 + 7; as a rule the second syzygy, as 

 in var. insculpta, is from between brachials 12+13 to between brachials 21+22; the 

 next occurs after an interval of from 8 to 11, usually 8, muscular articulations, and the 

 distal intersyzygial interval is from 6 to 13, usually 7-9, muscular articulations. 



P! is about 10 mm. long with 25-30 segments of which the first 5 or 6 are markedly 

 broadened and narrowly carinate on both sides. The pinnules following as far as P 4 

 are somewhat about 1 mm. shorter with about 20 segments of which only 4, or 3, 



