IIO PORIFERA. II. 



1894. C. alaskensis Lambe. The Bering Strait, The northern Pacific. 



1S94. - pulchra Lambe. The Aleutian Islands. 



1903. - Guiteli Tops. North-west of Cape Finisterre. 



The C. concrescens O. S.? enumerated by R. and D., which has only one form of ancorae and 

 is taken at a depth of 2900 fathoms, is, no doubt, an independent species. 



Kieschniek (Zool. Anz. XIX, 526) has established a C. ramosa, which Thiele (Abhaudl. der 

 Senckenberg. uat. Gesellsch. XXV, 947) states to be an lotrochota-spedes. In Semon: Zool. Forschungs- 

 reise in Austr. V, 571, Taf. XLIV, Fig. 11, the same author has again a C.ramosa, also here designated 

 as 11. sp., and C. dura and sessilis. Thiele, however, has informed me in a letter that all three species 

 belong to Iotrochota. 



The two species established by Lambe, alaskensis and pulchra, are somewhat deviating, partly 

 in their outer form, and to no slight degree in the skeletal structure, which shows longitudinal and 

 transverse fibres; besides they have a dermal skeleton of projecting bundles of spicules, and further 

 the spicules of these bundles are smaller than those of the skeleton. Therefore I think it to be doubtful 

 whether these two species belong to Ciiondrocladia sens, strict. 



Two more species may possibly belong to Ciiondrocladia viz. the Monanchora clathrata estab- 

 lished by Carter (Ann. Mag. Nat. Hist. Ser. 5, XI, 369, PI. XV, fig. 10 a— e), which seems to have had 

 a massive form, and the spiculation of which consists of subtylostyli and ancorae with five teeth; and 

 the Esperiopsis nitidis established by Kieschniek in the work quoted above (V, 572, Taf. XLIV, 

 Fig. 12, Taf. XLV, Fig. 51 — 52), which is erect, somewhat finger-shaped, and has a spiculation of tylostyli 

 and, according to statement, ancorse of two kinds, with six and with five teeth. — It is possible that 

 these two species together with the two above mentioned Chondrocladia-species established by Lambe 

 will form a separate genus. 



Artemisina Vosmaer. 



The form as a flat cusliion, or higher and more massive or roundish, or, finally, erect, stalked, 

 cylindrical or branched. The skeleton of irregular, halichondroid structure, consisting chiefly of scattered 

 spicules, between which irregular, polyspicular fibres may be found: regular fibres passing to the surfaa 

 occur most frequently towards the periphery. The dermal skeleton consists either of erect, projecting 

 bundles, or of a reticulation of more or less horizontal spicules. Spongiu present or wauling. Spicula : 

 Megasclcra styli or subtylostyli, most frequently of two forms , one forming the main skeleton, the 

 other the dermal skeleton ; the styli all quite smooth, or all slightly spinulous at the head-end. or only 

 the dermal spicules spinulous in this way. Microsclcra small isoclielo? palmataz and toxa smooth or some- 

 what spinulous ; to these forms may be added sigmata. 



1. A. arcigera O. Schmidt. 

 PI. I, Figs. 9— 11. PI. XIII, Fig. 3 a— f. 

 1870. Suberites arciger O. Schmidt, Grundziige einer Spongienfauna des atlant. Gebiet, 47, Taf. V 

 Fig. 6. 



