2784 Microscopical Society. 



wings is a whitish spot, but it is so lost in the pale ground colour that it only becomes 

 perceptible when the sun shines on it." A single specimen taken by Mr. Douglas, 

 in company with sericiella, May 4, 1849, at Coomb Wood. 



Myelois Artemisiella, Steph. MSS. Not closely allied to any species I am ac- 

 quainted with. Exp. alar. 7 — 9 lines. Head, thorax and anterior wings pale dirty 

 ochreous, the latter with a paler sinuous hinder fascia, followed by a dark cloud on 

 the costa, and preceded by a similar dark cloud a little removed from the costa, which 

 is continued as a dark streak along the middle of the wing to the base : near the 

 costa, a little before the hinder fascia, is a black spot ; and a row of dark spots 

 on the hinder margin : posterior wings pale cinereous. This species has been bred 

 by Mr. Simmons from larvae, feeding within the stems of Artemisia campestris. 



Bucculatrix cristatella, F-v-R. A single specimen, the locality of which is un- 

 known, is in Mr. Douglas's collection. A note of the distinctive characters of this 

 species appears in the Society's Transactions, vol. v. p. 128. 



Gracilaria ? Ocnerostomella. Exp. alar. 4 — 5 lines. Last joint of palpi stout 

 and not pointed : head, thorax, antennas and anterior wings concolorous, gray, some- 

 times with a slight ochreous tinge : the wings are entirely destitute of markings, 

 which readily distinguishes it from any known Gracilariae, whilst the longer palpi 

 immediately separate it from Ocnerostoma ; and the smooth head, long posterior legs, 

 and long cilia at the anal angle of the anterior wings, at once remove it from Argy- 

 resthia. I exhibited an imperfect specimen of this species to the Society in Novem- 

 ber last, as Argyresthia Amiantella ?, imagining the hairs on the crown of the head 

 to have been rubbed off : the sight of several fine specimens, taken by Mr. Douglas, 

 at Mickleham, in June, 1848, has couvinced me that it is not Amiantella, and not 

 even an Argyresthia ; but from the thickness of the last joint of the palpi it ill accords 

 with any known Gracilaria. 



Crambus uliginosellus, Z. in litt. Distinguished from C. pascuellus, with which it 

 has hitherto been confounded, by its shorter and less pointed anterior wings, the white 

 streak on which is less gradually pointed ; the posterior wings are whiter, and the 

 palpi and thorax are likewise whiter. One specimen taken at Lewisham, at light, 

 June 21st, 1848. 



Mr. Westwood exhibited a specimen of Ophion undulatum, taken in this country. 

 —J. W. D. 



Proceedings of the Microscopical Society of London. 



March 20, 1850. — Dr. Arthur Farre, President, in the chair. 



J. S. Ralph, Esq., H. Taylor, Esq., and J. Dennis, Esq., were balloted for and duly 

 elected members of the Society. 



A paper, by the President, entitled " An Account of the Dissection of a Human 

 Embryo of about the fourth week of Gestation, with some Observations on the Early 

 Development of the Human Heart," was read. After some preliminary observations, 

 Dr. Farre stated, that the embryo forming the subject of the paper, was expelled by 

 abortion, about three days before the meeting ; and, although no precise data were af- 

 forded as to the period of the commencement of pregnancy, the condition of the 

 embryo rendered it most probable to have been of the fourth week of utero-gestation. 



