KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 2. 85 



closely on one another in the closed state. The facet is large, and its fulcral ridge rims 

 at an angle to the rnain diameter of the whole slope; thus when the museles contracted 

 the main-axils would be bent downwards as well as outwards, and the axil-arms would 

 be separated from each other. The necessity for this arrangement is seen on examining the 

 axil-arms. On the exteriör of the closed crown there are seen from 4 to (> main branches, 

 of whieh one belongs to the primaxil, and one or two apiece to the secnndaxil, tertiaxil 

 and quartaxil arms. When only one main branch of an axil-arm is conspicuous, there 

 inay also be seen a smaller branch, of irregular appearance, lying to its left side; but 

 when two branches are conspicuous, that to the left is of irregular appearance, and occa- 

 sionally small ossicles may be seen attached to some of the morc irregular plates. By 

 dissecting away the 1. ant. arm, and exposing the primaxil-arm on either side of it, each 

 of these latter is seen to branch just as in C. gotlandicus; but the exaggeration in size 

 of the left-hand branches is tar greater than in that species. The simple armlets that are 

 given off on the side next the 1. ant. arm are squeezed into a more or less quadrangular 

 shape, with flat sides, while those that come off on the opposite side are squeezed down 

 under the large branch on the left, so as to be almost ont of sight. It is unnecessary 

 to dissect away more, so as to exposé the secundaxil, tertiaxil, and quartaxil arms; for the 

 externa! appearances agree with those presented by the primaxil arm sufficiently to warrant 

 the inference that they follow the same law and are subject to the same modifications 

 of it. The larger armlets given off from the alpha-axillary are always clear, while the 

 series of axillaries and internodal ossicles whieh are often exposed constitute the irregular 

 branch mentioned above. The internodes have a constricted appearance; while the axil- 

 laries can always be distinguishcd by the non-parallelism of their upper and lower sutures, 

 even when the face that bears an armlet is entirely hidden. Their upper sutures are far 

 more clear than their lower ones, whieh latter, as in C. gotlandicus, approach a syzygy; 

 they are also more conspicuous than the sutures between the ossicles of the simple arm- 

 lets. The larger branches are more transversety elliptical, the smaller ones more angular 

 in section than is the case in C. gotlandicus. The ventral groove is small and in section 

 a rounded V. 



Ornament: The specimens are not well enough preserved to show r more than a 

 trace of shagreen ornament; but in anv case it can hardly have been so marked as in 

 C. gotlandicus. 



Stem: Only in one specimen is anv preserved and that is a tiny fragment. Other 

 fragments, however, occur whieh are believed to belong to this species. They are like the 

 stem of C. gotlandicus, but have higher ossicles. 



This species was not figured by Angelin. 



Locality: Follingbo, (f); not known out of Gotland. 



