KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 2. 107 



been previously applied to a species once referred to Homocrinus, I should have adopted 

 it; as it is, the iiame chosen is that already mentioned as having been used by Angelin 

 in his MS. for the same figure. 



The present species resembles H. ancilla in the shape of the cup and in the slight 

 projection of the radials, but it may be distinguished from that species by the far greater 

 height of the radials as compared with the other plates of the cup. From H. cylindricus 

 it differs in the absence of any distal contraction of the cup, in the greater height of the 

 radials and in the less moniliform stem. From H. nanus it differs in the greater pro- 

 portional height of the infrabasals, in the less number of brachials in a series, and in the 

 less moniliform stem. It presents some resemblance to H. proboscidialis in the shape of 

 the ventral tube and in the length of the brachial series, but is distinguishable by the 

 greater height of all the plates and the more conical shape of the cup. It closely re- 

 sembles H. scoparius in general appearance, but differs in the slightly greater length of 

 the cup, in the greater regularity and less length of the arms, and in the greater regularity 

 of the stem-ossicles. 



Locality: Bursvik, (c). Not known out of Gotland. 



EUSPIROCRINID^E. 



Inadunata, Dicyclica; with anal x hexagonal or heptagonal, rising above the level of 

 the radials and truncating the posterior basal; with radianal pentagonal, resting on post- 

 erior and right posterior basals, supporting x on one side and right posterior rad i al on 

 the other and a plate of the tube sunk into the cup between them; with 5 arms. simple 

 and dichotomous; with tegmen solid; with anus at end of a massive anal tube. 



The genus Euspirocrinus is the type and, in the present state of knowledge, the 

 only genus that can with certainty be referred to this Family. There are, however, two 

 genera, — Closterocrinus and Ampheristocrinus, in which the strueture of the dorsal cup 

 in the anal area agrees closely with that of Euspirocrinus; in founding the Family, I 

 therefore placed these genera in it provisionally. ') Here they may stay till we know 

 more about them. 



Euspirocrinus may be said to have the dorsal cup of an advanced Dendrocrinite, 

 Buch as Parisocrinus, with the tegmen of a Cyathocrinid. Its arms might belong to either 

 a Dendrocrinite or a Cyathocrinite, but they are paralleled rather by the latter than the 

 former type. The anal tube is more like that of Cyathocrinus acinotubus than of any 

 other Dicyclic Crinoid. For these reasons it seems impossible to place it in any of the 

 families as now restricted or established. Hence the Family Euspirocrinidse. 



l ) Ann. Mag. Nat. Hist., ser. 6, vol. V, p. 384; May 1890. 



