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Show 1 9 0 4 .] SPONGES OF THE GENUS LEUCOSOLENIA. The diagnostic features of this sponge are :-(1) The constant shortness of the unpaired ray of the triradiate systems relative to the lateral rays, and the wideness of the anterior angle, frequently nearly 180°; (2) the two kinds of monaxons, both barbed-straight refringent ones always slender and small, relatively scarce; and curved ones, varying from very small to very large, always abundant. (d) List of Specimens examined. («) From Canon Norman's Collection. 1. Specimen from Bantry Bay, Ireland, with Norman's label " Leucosolenia botryoides," endorsed by Haeckel "Ascandra variabilis." (See text-fig. 95, figg. 16 a -16 g, p. 379.) 2. Specimens from Shetland, with label in Bowerbank's handwriting " Grantia botryoides Johnston, more largely developed than usual." Also a label by Norman '■'■Leucosolenia botryoides, very large, Shetland," across which is written in Haeckel's handwriting "Ascandra variabilis H." These specimens are of the same batch as No. 8 below. 3. Specimens received by Norman from Haeckel, collected at Bergen, Norway, with printed label " Ascandra variabilis H." 4. Specimen received by Bowerbank as a type of Leucosolenia, contorta, from Guernsey; sent to Haeckel for examination, and returned with label in Haeckel's handwriting as follows:- " Ascandra contorta H. " (Leucosolenia contorta Bwbk.) " Guernsey. Bowerbank." The specimen is a quite typical variabilis, with a slight admixture of Sycon spicules. 5. Specimens growing on seaweed with Grantia compressa, from Polperro, Cornwall, and identified by Haeckel as Ascandra variabilis: my preparations show a mixture of spicules of variabilis and complicata. (b) From the British Museum. 6. Bowerbank Coll., No. 1017. The type specimen of Bowerbank's " Leuconia somesii,'' figured in Brit. Spong. iii. pi. xci. fig. 6. With label in Bowerbank's handwriting- " Leuconia somesii Bwk., sent to me by Mr. H. Lee, 15.9.73, said to have been found alive in the aquarium " (i. e. at Brighton). (See text-fig. 95, figg. 19 a-19 h, p. 379.) 7. Bowerbank Coll., 1018. Another specimen with Bowerbank's label " Leuconia somesii, Brighton Aquarium, sent by Mr. Lee, 5.11.73." Figured in Brit. Spong. iii. pi. xci. fig. 8. 8. Bowerbank Coll., 1019. Another specimen with label similar to the last. Figured in Brit. Spong. iii. pi. xci. fig. 7. (See text-fig. 95, figg. 18a-18e, p. 379.) P roc. Z ool. Soc.-1904, Y ol. II. No. XXY. 25 |
