PORIFERA. II. 



E. vancouverensis Lambe .... Isochelae palmatae. 



- quatsinoensis Lambe 



- laxa Lambe 



- rugosa Thiele — 



- pedicellata mihi — 



- (Isodictya) collina B sigmata. 



? - (Halichondria) rigida B. . . . Isochelae, sigmata. (If this species proves to be an Esperiopsis, 



rigida Lambe will have to change its name). 



- cylindrica R. and D Isochelae palmatae, ?toxa. 



- symmetrica R. and D sigmata of two forms. 



- typichela mihi — of two forms. 



- pulchella R. and D — of two forms, isochelae arcnatae. 



- prcedita Tops isochelae arcnatoe, sigmata. 



- vittosa Cart of three forms, sigmata. 



- flagellavi mihi of two forms, sigmata, sigmata flagellata. 



- decora Tops of three forms, 



- forcipula mihi isochelae arcuatae, sigmata, forcipes. 



- polymorpha Tops Isochelae arcuatae, sigmata of two forms, toxa (small, sharply bent). 



- Schmidlii Arnesen — sigmata. 



- glomeris Tops 



? - (Holopsamma) turbo Cart. . Isochelae. Dendy, after having found isochelae in this very 



deviating form, refers it to Esperiopsis. 



Halichondria folia ta Bow., which Topsent, in the mentioned work, refers to Esperiopsis, is an 

 Echinoclathria; the same holds good of Esperia foliata Frstdt. 



In the generic diagnosis I have given as characteristic microsclera isochelae palmatae; as will 

 be seen, three species deviate from this rule, viz. polymorpha Tops., Schmidlii Arnesen, and glomeris 

 Tops, which have, as to chelae, only isochelae arcuatae, which seem to be of quite typical form. As above 

 mentioned, however, the difference between chelae palmatae and arcuatae is not quite sharp, and per- 

 haps it will be necessary only to say that the characteristic microsclera of the genus are isochelae. 



I shall still add that Kieschnick (Semon: Zool. Forschuugsreisen in Austral. Band V, Denkschrift. 

 Med. Nat. Gesellsch. Jena, Band 8, 1900, 572, Taf. XLIV, Fig. 12, Taf. XLV, Fig. 51—52) has established a 

 species, £. viridis. As the other species mentioned in this quite useless work it is unrecognizable, but 

 it seems most nearly to be a Chondrocladia-species. Of microsclera are mentioned isochelae with six teeth 

 (the very bad figure shows seven), and smaller isochelae with five teeth (to which a quite useless figure). 



r. E. villosa Cart. 

 PL I, Fig. 4. PI. VIII, Fig. 1 a— i. 

 1874. Esperia villosa Carter, Ann. Mag. Nat. Hist. Ser. 4, XIV, 213, PI. XIII, figs. 13—15, PI. XV, fig. 36. 

 1879 Unknown sponge Carter, Journ. of the Roy. Micr. Soc. II, 502, PI. XVII a, fig. 12 a, b, c. 

 1882. Esperiopsis villosa Carter, Ann. Mag. Nat. Hist. Ser. 5, IX, 296. 



The Ingolf-Expedition, VI. 2. 2 



