ECHINOIDEA. II. 



153 



Hoyle: Revised List Brit. Echinoidea. p. 422. — Bell: Echinoidea of South Africa, p. 175. — Grieg: 

 Nordlige Norges Echinodermer. p. 2,4- — Doderlein: Arktische Seeigel. Fauna Arctica. IV. p- 384. 

 Echinoiden d. deutschen Tiefsee-Exped. p. 256. Taf. XXXIV. 4— 8. XLIX. i— 2. 



Non: A. Agassiz: Preliminary Rep. Echini & Starfishes dredged in deep water between Cuba 

 and the Florida Reef by L. F. de Pourtalés. I. Catalogue of the Echini. p. 275, 294. Bull. Mus. Comp. 

 Zool. 1869. =:Blake>-Echinoldea. p. 69. PI. XXVI. 7— 18. — Verrill (418). p. 139. 



Other less important literary references are fouud in « Revision of Echini , Ludwig: Echino- 

 derraen d. Mittelmeeres and Bell's Catalogue. 



As appears from the numerous literary references this species has been mentioned and figured 

 very often. Nevertheless, soniething still remains to be done. — Regarding the structure of the test 

 I may only point out that the hinder prolongation of the labrum is narrow and reaches only to the 

 middle of the first adjoining ambulacral piates. (In one specimen, however, I have found it to reach 

 the second ambulacral piates, and in a few specimens to the second ambulacral plate on one side only). 

 The first plate which reaches within the subanal fasciole is, as is usually the case among the Prymno- 

 desmic Spatangoids, the 6th, and only three pairs of pores are fouud inside the fasciole. These features 

 are of importance for the comparison witli the species described below. 



The pedicellariæ were first mentioned by Koehler (Op. cit.), who finds three kinds of them, 

 which do not, however, present aucun caractére saillant, qui permette d'en faire une déscription 

 speciale: (Op. cit.). I cannot agree with Koehler herein; on the contrary I find the pedicellariæ of 

 the £risso/>s/s-s\:)ecies, especially the globiferous ones, very characteristic and of great importance for 

 distinguishing the different species. Quite recently Professor Doderlein (Echinoiden d. deutschen 

 Tiefsee-Exped.) has described and figured the pedicellariæ of the form of Br. lyrifcra which occurs at 

 the Cape of Good Hope. Though his figures are, most of them at least, very good, I think it will 

 not be found to be superfluous, when I give some figures of the pedicellariæ of this species also — 

 — partly because the Cape-specimens of Br. lyri/era ouglit, in my opinion, at least to be regarded as 

 a distinct variety, and partly because these figures are wanted for the comparison with those of the 

 new species here separated from lyrifera. Several details will also be found more clearly represented 

 than in the photographic figures given b)- Doderlein. — F"or the rest both descriptions and figures 

 were prepared a loiig time before Doderlein 's work had appeared. — I have found the same four 

 kinds of pedicellariæ as found by Doderlein, ophicephalous pedicellariæ not having been found by 

 either of us. 



The globiferous pedicellariæ (PI. XVIII. Figs. i, 6, 25, 26) are rather conspicuous. The thick skin 

 that invests the valves is probably of a glandular nature ; in the living animal it is of a vivid yellow 

 colour. The blade is a narrow tube with a small opening at the point, bordered by two long teeth. 

 The basal part is rather wide, somewhat variable in form. At the lower end of the stalk there is a 

 whorl of rather long, projecting thorns, but apparently never on more than half the circumference of 

 the stalk. Not always a distinct thickening at the upper end of the stalk. This kind of pedicellariæ 

 I have found on almost all the specimens examined from the Mediterranean ; on those from the 

 Danish Seas it is not so common. The}' are generally found on the abactinal side between the fasciole 



The Ingrolf-Expedition. IV, 2. 20 



