94 The Ottawa Naturalist. [August 



greatly helped the revision of the diagnoses. I am further specially 

 indebted to Professor H. C. Bumpus for the loan of the holotype 

 of Cyathocrinus nucleus. 



The contractions and symbols used in this paper are those 

 adopted in Part III. The Echinoderma of "A Treatise on 

 Zoology", edited by E. Ray Lankester (London, 1900 ; see p. 

 143). The terminology of the type-material follows the recent 

 revision by C. Schuchert & S. S. Buckman (see Science [n s], 

 XXI, p. 899 ; 9 June, 1905 ; Ann. Mag. Nat. Hist. [7], XVI, p. 

 102 ; July, 1905 ; and Introduction to 'Catalogue of the type and 



figured specimens of fossils ' Bull. U. S. National 



Mus., LI II, Pt I ; Sept. 1905). References to previous litera- 

 ture are confined to passages of systematic importance, and, for 

 the sake of brevity, the plate and figure numbers are usually 

 omitted. 



SWEDISH SPECIES. 



Botryocrinus ramosissimus. 



Botryocrinus ramosissimus, Ang'elin, 1878, 'Iconogr. Crin. Suec' p. 24. 

 Botryocrinus corallum, Ang'elin, 1878, op. cit. p. 24. 



Botryocrinus ramosissimus, Bather, 1893, 'Crin. Gotland'. Svensk Vet.- 

 Akad. Handl., XXV, No. 2, p. 117. 



Dorsal cup a wide cone, with straight sides, except for a 

 slight projection of RR towards the facet. Height of cup (11. 

 mm), 100 ; width at base, 56 ; width at summit, 139. IBB and 

 BB wider than high. RR not higher than wide. Arm-facet .63 

 of R. x supports 3 or more tube-plates. Proximal columnal 

 obscurely pentagonal. 



Lower Ludlovian, Lindstrom's bed/, Gotland. 



Cotypes of B. ramosissimus and B. corallum in Riksmu^eum, 

 Stockholm. As lectotype of B. ramosissimus, should betaken the 

 specimen lettered b (Crin. Gotland, p. 117). 



Botryocrinus cucurbitaceus. 



Sicyocrinus cucurbitaceus, Angelin, 1878, ' Iconogr. Crin. Suec'. p. 23, 24. 

 Botryocrinus cucurbitaceus, Bather, 1893, 'Crin. Gotland,' Svensk. Vet.- 

 Akad. Handl. XXV, No. 2. p. 120. Et locc. ibi citt. 



Dorsal cup a wide cone, with straight sides except for a very 

 slight projection of RR towards the facet. Height of cup (5. 9 



