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Show 174 ME. A. D. MICHAEL ON AN [Mar. 5, The hgpobranchials are elongated and, save for their anterior curvature, almost straight. The ceratobranchials are slightly broader osseous palettes than in P. erithacus, and they are hardly as much curved. It is interesting to find that this part of the anatomy of Stringops would alone suffice to declare the essentially Psittacine nature of the bird. It also proclaims it to be a peculiar Psittacine form. With no affinities whatever for the Loriidae (so far as I have yet been able to examine that family), it is also very distinct from Psittacus. I have not been able to find any representation of a Psittacine hyoid to which that of Stringops shows any marked resemblance. In conclusion I think we have, in the existence of the parahyal arch, a very distinctive character for at least three genera of Loriidae ; and, when we consider how closely allied other genera of that family are to Lorius, Eos, and Trichoglossus, we may, I think, expect to find that a general resemblance exists between the hyoids of the entire group. In other skeletal characters there are some interesting differences between Psittacus and Lorius, as I hope to be permitted on some future occasion to point out. 2. A Study of the Internal Anatomy of Thyas petrophilus, an unrecorded Hydrachnid found in Cornwall. By A. D. M I C H A E L , F.L.S., P.R.M.S., & c [Eeceived February 27, 1895.] (Plates VII.-IX.) CONTENTS. Page General Observations and Habitat 174 Description of the new Species 175 The Integument 178 The Dermal Glands 179 The Alimentary Canal and Excretory Organ 180 The Salivary Glands 188 The Male Genital Organs 192 The Female Genital Organs 194 The (so-called) Genital Suckers 195 Glands of unknown Function 197 The Palpal Organs 198 The Nervous System 199 The Eespiratory Organs 203 Bibliography 205 Explanation of the Plates 205 The beautiful Acarid which forms the subject of this paper discovered by my friend Mr. E. Bostock when we were collecting together in the neighbourhood of the Land's End, Cornwall; I have since met with numerous specimens in the same locality, but have not hitherto found it elsewhere. So far as I have been able to ascertain it has not been previously observed, and is unrecorded. |
