30 REPORT — 1842. 



89. Trygonoptera testacea (Miiller und Henle, Plagiostomen, p. 174.) 



(Raia testacea, Parkinson, i. 1. 1 46.) 



Myliobatides. 



90. Myliobatis nieuiiofii (Miiller und Henle, Plagiostomen, p. 177.) 



(Rata macrocephala, Parkinson, i. t. 48.) 

 The following Plagiostomi inhabit the Australian seas: — HemiscyUiwn 

 malaianum (M. und H.), Crossorhinus barbatus (M. und H.), Carcharias 

 (Prionodon) maoo (M. und H.), C. (Pr.) melanopterus (M. und H.), He- 

 miscyUiwn oceUatum (M. und PI.), //. trispeculare (Richardson), Cestracion 

 phiUipi (M. und H.), Trygonorhina fasciata (M. und H.), Tceniura lymma 

 (M. und H.), Narcine tasmaniensis (Richardson). 



Cyclostomi. 



91. Heptatrema Dombeyi (Lacepede, i. 23). (Petromyzon cirrhatus, G. 

 Forster, ii. t. 251 ; J. R. Forster, MS. II. 24, apud Schn. p. 532; Home, 

 Phil. Tr. for 1815, p. 258.) 



Discovered by the Forsters in Dusky Bay. 



Report on the Progress of the Meteorological Observations at 

 Plymouth. By W. Snow Harris, F.R.S., fyc. 



Since I last had the honour of presenting to the Association the results of 

 the discussion of the hourly meteorological observations, made and registered 

 at H. M. Dock-yard at Devonport, three additional years have been nearly 

 completed ; and I shall be in a position at the close of the present year (1842) 

 to revise and bring under one general view the results of the series, con- 

 tinued now hourly, without any material omission, since the year 1S32, and 

 which will hence complete for temperature ten years' observations. The vast 

 mass of registered observations of the different instruments which the Asso- 

 ciation has entrusted to my care, have not been so far discussed and brought 

 under an appropriate form, as to enable me, on the present occasion, to enter 

 fully upon them ; nor indeed is it desirable to do so before the observations 

 of the present year are complete and can be included with the preceding 

 years. The only notice, therefore, of the further progress of the meteoro- 

 logical register at Plymouth, which it is at present in my power to submit for 

 the consideration of the Section, is a general discussion of five years' results 

 of the barometer and of experiments on the wind made with Whewell's ane- 

 mometer, and which I venture to hope the Association may deem not alto- 

 gether unworthy its attention. 



In the annexed table and accompanying chart (pi. iv.) will be found the 

 mean hourly pressure for each of the years 1837, 1838, 1839, 1840 and 

 1841, together with the mean of these years deduced from 43,800 observa- 

 tions, at 75 feet above the level of the sea, and reduced to 32° of Fahren- 

 heit's scale by Schumacher's tables, from the table referring to the expan- 

 sion of the mercury without reference to the scale of measure, the instrument 

 employed being of the peculiar construction already noticed in the Reports 

 of the Association*, and to which that table is most perfectly applicable. 



In laying down the graphical delineations given in this chart, the same 

 method was resorted to as in my preceding Report three years since, viz. 



* Reports of the British Association for 1833, p. 415. 



