KUNOL. SV. VET. AKADEMIENS HANDLINGAR. BAND 59- N:f) 4. 9 



Specimen 11 (St. 12) C XIV (of these V are young ones, of which IV are R- 

 placed) 12, 12, 11, 11, 10, 11 (young, R), 12, 10 (young IR), 12, 11 (young, R), — , 

 12 (young, R), 12, — (young, R indistinctly segmented, probably regenerated in an 

 old joint-cavity) . All the old C except one or two are IR-placed. The specimen 

 is a rather intermediate form. 



Specimen 12 (St. 12) C XJI (II small ones, II empty joint-cavities) |11|11| 

 II, 13, 11, 12, 11, — , 11 (very young), 11, 11 (young), - - 1. % of the circum- 

 scription with purpurea- arrangement. Both the young C grow in the same radius on 

 each side of a greater radial C. 



Specimen 13 (St, 12) C VI 11 10 10 10 II, 10. A typical purpurea. 



Specimen 14 (St, 14) C IX 10, 11 (young) K), 11|9|10, 10 10, 10 ; . Purpurea- 

 form. 



Of these 14 specimens examined numbers 2, 13 and 14 are of the typical 

 purpurea-iorm, the rest of a more or less decided pectinata-type. N:rs 3 and 7 might 

 be thought to represent a purpurea if \ve only look at the divergence of C, but if 

 we examine the condition more closely \ve find that the resemblance is only appar- 

 ent. The specimens 6, 8, 11, 12, and in a more or less decided degree other ones 

 also (for instance sp. 5), offer illustrations of transition- or intermediate forms. 



A difference that is not noted by A. H. Clark is that the comb in C. pur- 

 purea is considerably less developed and provided with fewer teeth, which, as they 

 proceed from a smaller part of the breadth of the segment, seem to be more sparse. 

 This might perhaps be a differentiating character, but I consider it equally prob- 

 able that the difference is due to different ages, especially as the small specimen 

 from St. 3 has a similar comb. In 1915 H. L. Clark made a contribution to the 

 biology of the Australian Crinoids and he treats among others C. purpurea, which 

 (at Maér, where he has worked) is much more common than C. pectinata. He says 

 he has found among the former mature specimens, a fact that would support the 

 theory that in North Australia the forms are distinguished as really different types. 

 Is there any paedogenetical phenomenon present here or are the intermediate forms 

 to be regarded as hybrids? 



The purpurea-iorm may be kept as a variety until the exact state of affairs 

 has been established. 



Comaster (Agazziz) A. H. Clark. 

 Comaster typica (Loven). 1 



Phanogenia typica 1866 S. Loven op. cit. p. 223 — 233; 1008 A. H. Clark op. cit. 11, p. '203. 



Actinomctra stellata 1879 V. H. Oarpenter op. cit. p. 390. 



Actinomctra multifida (part) 1884 Beij< »Alert», p. 169; 1894 op. cit. p. 394. 



1 A. II. Clark's new vvork: The unstalked Crinoids of the Siboga Expedition (1918), which indicates 

 very important progress in our knowledge of the Crinoid system, has unfortunately not come into my hands 

 before my investigation was already sent to he printed. According to Clark's monograph C. tyjpica (Loven) is 

 synonymous with C. norcrguinecr, (J. Muij,.). My specimens also agree closely with C. minimas A. II. Ci,. 

 which is apparently very similar to young specimens of ('. nov&guineté. 



K. Sv. Vet. Akful. Handl. Band 59. N:o 4. ■_' 



