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Show 252 REV. O. P. CAMBRIDGE ON NEW SPIDERS. [Jnne 5, While in the embryonal or cartilaginous stage, both " pleurapo-physial" or iliac (ib. il) and «haemapophysial" or pubic (ib. pa) sustainers of the developed, and in Fishes fin-like, "appendage of such pelvic arch are continuous with the primitive "bar or plate (bp, basipterygium). But if they are so evolved as secondary and subordinate members, their subsequent ossification exemplifies their claim as independent or distinct elements of their vertebral segment. Lepidosiren and Polypterus retain the later segmentation of the " basipterygium," with feeble rudimentary indications of rays in the narrow skin-fold which it supports. The proximal piece of the fin-skeleton of Ceratoclus, like that of Lepidosiren, answers to the basipterygium -metapterygium, not to the mesopterygium, which, as Balfour shows, is a secondary character, and is not developed in certain Fishes, e. g. Scyllium. I cannot conclude without quoting the last letter with which I was favoured by m y friend :- " Trinity College, Cambridge, Dec. 7th, 1881. " DEAR PROFESSOR OWEN, " I am much obliged to you for your kind note about m y paper on the ' Development of the Paired Fins.' I accept the justice of your criticism on my use of the term ' girdle.' I used the term merely because it was a term in common use, and must plead guilty to never having troubled myself about its derivation **. I shall, however, in future use the expression ' arch' instead. " Very sincerely yours, " F. M. BALFOUR." 2. On some new Genera and Species of Spiders. By the Rev. O. P. CAMBRIDGE, M.A., C.M.Z.S., &c. [Received April 23, 1883.] (Plates XXXVI. & XXXVII.) Eight Spiders, representing, as it appears to me, as many new genera, are described and figured in the present paper from examples in m y own collection. Two of them belong to the family Therapho-sidao, one to the Drassidae, and the remaining five to theThomisidae. Three species are from Ceylon, three from Caffraria, one from New Zealand, and one from California. For the Ceylon species I am indebted to the late M r . G. H . K. Thwaites ; for those from Caffraria to Mr. Mansel Weale ; for the New-Zealand species to Captain F. W . 1 " GIRDLE-Belt or Zone. Any thing drawn round the waist and tied or buckled."-Johnson. The " pelvic arch " is inverted ; its piers, as a rule, are based on the sacrum: the " pectoral arch " is inverted, and its piers, save in most Fishes, are free. |
