TELOTROCHIDIUM. [ 759 ] 



TEST-OBJECTS. 



of Oribatea (Michael, Jn. Mic. Soc. 1879, 

 247: 1880,32, 177). 



TELOTROCIIID'IUM, Kt. A genus of 

 Peritrickous Infusoria. Five, ovate or cam- 

 panulate, no tail ; two ciliary rings ; anal 

 aperture posterior. 



T. crateriforme ; freshwater. (Kent, Inf. 

 843.) 



TEM'ORA, Baird. A genus of Copepo- 

 dous Eutomostraca, family Diaptomidse. 



Char. Thorax composed of five, abdomen 

 of three j oints ; lesser antennae two-branched ; 

 first four pairs of logs each giving off a two- 

 jointed branch. T. finmarchica. On the 

 British coasts. (Baird, Br. Entomostr. 227 j 

 Brady, Cop. i. 37.) 



TENDON. See LIGAMENTS. 



TEXTHKE'DO, Leach. A genus of Hy- 

 menopterous Insects, of the family Tenthre- 

 diuidne (Saw-flies). 



The species of Tcnthredo and of the other 

 genera belonging to the family, both of 

 which are very numerous, are interesting on 

 account of the remarkable structure of the 

 ovipositor, which consists of two flattened 

 and curved saw-like plates. These are used 

 to saw the leaves of plants, for the deposi- 

 tion of the eggs. 



The insects are found upon gooseberry- 

 bushes, rose-bushes, the white thorn, the 

 willow, alder, poplar, the plum- and other 

 fruit-trees, cabbage, turnip, bramble, &c. 

 The larvae are very destructive to agricul- 

 tural crops. 



T. nassata is represented in figure 366 

 (P- 437). 



BIBL. Westwood, Introduction, ii. 90. 



TEREBEL'LA. A genus of Tubicolar 

 Annulata. 



The animal forms a tube of sand and por- 

 tions of shell, agglutinated by a secretion. 

 Carpenter remarks that in the respiratory 

 organs situated in the part outside the tube 

 the head two liquids may be seen circu- 

 lating: one colourless, containing numerous 

 cell-like corpuscles, which can be seen in 

 the smaller and more transparent species to 

 occupy the space intervening between the 

 outer surface of the alimentary canal and 

 the inner wall of the body, and to pass 

 from this into canals, which often ramify 

 extensively in the respiratory organs, but 

 are never furnished with a returning series 

 of passages ; while the second is a usually 

 red liquid containing few particles, and en- 

 closed, in a system of proper vessels commu- 

 nicating with a central propelling organ. In 

 Terebella a distinct provision is made for the 



aeration of both fluids ; for the first is trans- 

 mitted to the tendril-like tentacula which 

 surround the mouth, whilst the second cir- 

 culates through the beautiful arborescent 

 branchiae situated just behind the head. 

 The former are covered with cilia, the action 

 of which continually renews the water in 

 contact with them, whilst the latter are 

 destitute of them. The colourless liquid 

 is probably blood, and the red belongs to the 

 water-system. 



BIBL. Huxley, Comp. An.} Carpenter, 

 Microscope. 



TERPSIN'OE, Ehr A genus of Diato- 

 macese. 



Char. Frustules tabular, obsoletely 

 stalked, subsequently connected by isthmi, 

 and with transverse, short, interrupted, 

 capitate vittae; valves in side view with 

 lateral inflations. 



T. musica (PI. 19. fig. 33, side view; PL 25. 

 fig. 10, front view). Frustules very faintly 

 punctate, in front view rectangular oblong ; 

 side view equally inflated in the middle and 

 at the ends, in older specimens constricted 

 in the middle, inflated beyond the middle 

 towards both ends, the apices produced and 

 obtuse, the nodules separated by septa. 

 Length 1-180". 



T. indica (Anaulus ind., E.). 



BIBL. Ehr. Abh. Bed. Ak. 1841, 402; 

 Kiitz. Batill. 128 ; So. Ala. 119 ; Pritchard, 

 Inf. 850. 



TESSEL'LA, Ehr. A genus of Diato- 

 maceaa. 



Char. Frustules broadly tabular, not con- 

 catenate, with crowded, longitudinal, alter- 

 nate vittae, interrupted in the middle; stipes 

 absent (?). Marine. 



T. interrupta (PL 19. fig. 35). Length of 

 frustules 1-580; breadth 1-560 to 1-120". 

 Found with Striatella. 



BIBL. Ehr. Inf. 202; Kiitz. Bacill. 125; 

 Sp. Alg. 114; Pritchard, Inf. 804. 



TESTAMCEBIFOR'MIA, Carter. Pa- 

 rasitic, lobular, and wild-growing Forami- 

 nifera, some nearly \ inch long. Holodad- 

 nia and Cysteodictynia with calcareous, 

 Ceratestina with chitinous test. Gulf of 

 Manaar. (H. C. Carter, Ann. N. H. June 

 1880, 446.) 



TEST - OBJECTS. Test-objects are 

 microscopic objects used to determine the 

 value of object-glasses. 



We must presume that the reader has 

 perused the remarks upon object-glasses in 

 the INTRODUCTION (p. xvi), also the article 

 ANGULAR APERTURE; otherwise the 



