DE. T. DATIDSOX OX ]?ECEXT BRACHIOPODA. 205 



raised strite with very wide interspaces. Colour light yellow. Length and hreadth 

 6i lines. 



Sab. Singapore and Philippines (Cuming) ; China Seas (Stimpson, Wilkes, Gould) ; 

 Seto-Uchi (Akasi), 17 fathoms; Isu-Sima, 17 to :25 fathoms; Tahu-Sima, 20 fathoms, 

 on coral ; Japanese waters (Adams). Five upper valves were dredged by the ' Challenger' 

 Expedition at Station 190, lat. 8° 50' S., long. 130° 5' E. Tlic species was also dredged 

 by Capt. St. John in the Straits of Corea, attached to shells and associated with 

 Laqiieus pictus, lat. 33° 4' N., long. 129° 18' E. 



Ohs. Although usually radiately finely striated, the strife were so faintly indicated in 

 some examples that have come under my notice that the shell appeared smooth, and in 

 that condition it was difficult to distinguish it from Dlscimsca (dluntica. In his Conch. 

 Icon., Monograph of Orbicnla, Lovell Ileeve states that " this species has a wide dis- 

 tribution in Eastern seas. On comparing authentic specimens received from Dr. Gould, 

 one of which is given at fig. ] h, pi. ii., collected in the China Sea by "VYilkes's exploring 

 expedition, I find them identical with specimens collected by Mr. Cuming, attached to 

 fragments of Pidlastra, Pinna, and 3Ialleus, at Singapore and at the Philippine Islands. 

 The sculpture varies in strength; on young specimens, as stated by Dr. Gould, the 

 radiating stria? are scarcely develoj^ed ; in older specimens, and especially specimens 

 that have had to contend with irregularities in their place of attachment, the sculpture 

 has a minutely-latticed character, like the grains of a thimble. The under valve is 

 thinly membranaceous, or thicker, concave or convex according to circumstances of 

 habitation ; and the position of the slit obviously varies with the position of the vertex 

 in tlie opposite valve. On a flat place of attacliment the shell is symmetrically orbicular, 

 and the vertex and subincumbent slit are nearly central, but when attached to a sloping 

 or declivitous substance the vertex is pressed to one side, and the slit of the under valve 

 follows the same direction." 



Family LINGULID.E. 



The recent species belonging to this family are representatives of the genus Lingula, 

 Bruguiere (1789), and of the genus or subgenus Glottidia, Dall (1870). 



Genus LIXGULA. 



1. Linyula anathia,\^s.xaa.Yck, 1819. 



2. Mans, Swaiuson, 1823. 



3. tumidula, Reeve, 1841. 



4. Murphiana, King, 1859. 



5. Lingula Reevii, Davidson, 1852. 

 G. exusta, Reeve, 1857. 



7. Jaspidea, Adams, 1863. 



8. Adamsi, Dall, 1873. 



There are, besides these, three uncertain so-termed species — Lingula smaragcUna, 

 Adams, 1803; L. hirimdo, Reeve, 1859; audi, lepidula, Reeve, 1803. Hancock's L. 

 ajfinis I consider to be the true Lingula anaiina, the species Hancock figured as L. anatina 

 being really the L. Mnrplnana of King. 



Up to the year 1870 the species now classed with Glottidia had been described as 



