192 Leuckart: Bericht üb. d. Leist. in d. Naturgeschichte. 



hält Verf. für den Typus eines eigenen Gen. n. Pycnopodia, für das 

 er folgende Diagnose aufstellt: Body depressed, multiradiate ; rays 

 equal ; disk very broad, but with the inter-radial septa of its cavity 

 extending inward quite to the mouth, and nearly reaching the walls 

 of the stomach; septa thin, with only minute scattered calcareous 

 deposits, but strengthened near their sharp inner edges by a flexible 

 perdendicular band of articulating feathered plates. Dorsal skin 

 very sparsely provided with calcareous matter, containing only a 

 few small scattered tergal ossicles, bearing slender spines. On the 

 back of the rays these ossicles are rounded and entirely isolated, 

 but on the disk they are sometimes connected by a thin deposition 

 of calcareous matter. Ambulacral furrows very broad, with the 

 pores in four rows, except at the base where they form only two 

 rows. Interambulacral ossicles strongly developed and very regulär 

 in their arrangement; these of the outer row trilobate, closely ap- 

 proximated, and imbricated. One madreporic plate. Papulae in 

 Clusters. (Unter dem Namen papulae versteht Verf. die sogenannten 

 Tracheen.) 



Aus S a r s' Oversigt u. s. w. heben wir folgende Diagnosen 

 hervor: Astropecten arcticus Sars (p. 34). Sinubus inter brachia 

 rotundatis; radio disci ad eundem brachiorum ut 1 : 2Y3 — 2V2; scu- 

 tis marginalibus utrimque 24, scuto terminali impari hippoerepi- 

 formi excepto, omnibus tuberculis conicis brevissimis undique tectis; 

 superioribus (in medio brachio) spatio paxillifero sexies ad octies 

 angustioribus, inferioribus latitudinem superiorura ter ad quater su- 

 perantibus, scutis adambulacralibus spinis cylindrico-conicis 10 — 14 

 obsitis, quarum exteriores tuberculis seu spinis brevibus scutorum 

 ventralium parum maiores , interiores verum sensim longiores et 

 tres intimae seu sulco 'ambulacrali vicinae illis in scutis ventralibus 

 quater vel quinquies longiores sunt. Color pallide miniatus aut 

 aurantiacus. 



Pteraster militaris 0. Fr. Müll. (p. 57). Disco modice convexo; 

 brachiis longioribus ; radio disci ad eundem brachiorum ut 1:2, 

 paxillis dorsalibus brevioribus, conicis, apice aciculis 2 — 3, raro 4 

 (solummodo in paxillis perianalibus pluribus), divergentibus mobili- 

 bus coronato. Paxilli vagina cutanea obducti sunt , quae etiam 

 aciculas obvelat easque cuti dorsali exteriori affigit. Tessella ma- 

 dreporiformis nodulosa seu tuberculis minutis conicis irregulariter 

 obsita. Angulus quisque ovalis pinnis transversalibus duabus inti- 

 mis discretis formatur. 



Pteraster pulvillus Sars (p. 72). Disco tumido seu pulvinato, 

 brachiis brevioribus; radio disci (in bipollinari) ad eundem brachio- 

 rum ut 1 : IV2 paxillis dorsalibus maioribus, cylindricis, apice aci- 

 culis 8 — 15 divergentibus mobilibus coronato. Paxilli vagina cuta- 



