HALICHONDRINA. 
Spong. 21 
description, pp. 211-216, pi. vii, figg. 4-6, pi. xx, fig. 1, a-o ; M. 
emphysema (O. S.), diagnosis and description, pp. 216-219, pi. xx, 
fig. 2, a-d : Lundbecr (17). 
Microciona discreta , n. sp., Calbuco: Thiele (36) pp. 447-449, fig. 65, a-e. 
Mycale Gray, defined: Baer (1) p. 20. — J/., for Esperella Vosm., diagnosis 
and characters : Lundbeck (17) pp. 23, 24. — M. imperfecta , n. sp., 
Zanzibar : Baer (1) p. 20, pi. ii, fig. 5, pi. v, figg. 3-8. — M. intermedia 
(O. S.), remarks on, p. 43 ; M. lingua (Bow.), diagnosis and description, 
includes Esperella vosmaeri Levinsen, pp. 29-34, pi. ix, fig. 6, a-fi and 
text-fig. 1 : Lundbeck (17). — M. magellanica (Ridley), described : 
Thiele (36) pp. 442, 443. — M. sp., described : Thiele (36) p. 443, 
fig. 61, a-d. — M. titubans (O. S.), diagnosis and description, pp. 41-43, 
pi. x, fig. 3, a-h ; M. thaumatochela , n. sp. for Esperella intermedia 
Vanhoffen (non Schmidt), Holstensborg, 30 fathoms, East Greenland 
9-11 fathoms, and West Greenland, pp. 39-41, pi. x, fig. 2, a-g ; M. 
ovululm (O. S.), diagnosis and description, includes Esperia lanugo 
O. S. and Esperia stolonifera Merejkowsky, probably also Isodictya 
lobata Bow., I. clarkei Bow., and Esperiopsis modesta Lambe, pp. 34- 
39, pi. i, figg. 6-8, pi. x, fig. 1, a-e ; M. placoides (Cart.), diagnosis and 
description, pp. 24-29, pi. ix, fig. 5, a-t : Lundbeck (17). 
Mycalece for Esperellince : Lundbeck (17) p. 7. 
Myxilla 0. S., defined and characterised : Dendy (8) p. 168 : Lundbeck 
( 17) pp. 131, 132: SvarchevskiI (35) p. 29. — M. arenaria n. sp., 
Gulf of Manaar and pearl banks off' Aripu : Dendy (8) p. 169. — 
M. brunnea Hans., diagnosis and description : Lundbeck (17) 
pp. 144-147, pi. iv, fig. 11, pi. xiv, fig. 6, a-h. — M. chilensis n. sp., 
Calbuco : Thiele (36) pp. 443, 444, figg. 22, 62, a-c. — M. diversian- 
corata , n. sp., from Denmark Strait, 170-310 fathoms, pp. 150, 151, 
S I. v, fig. 3, pi. xv, fig. 2, a-i; M. fimbriata (Bow.), diagnosis and 
escription, pp. 141-144, pi. iv, figg. 9, 10, pi. xiv, fig. 5, a-i; M. grisea 
Hans., a synonym of Lissodendoryx complicata (Hans.), rp v., p. 166 ; 
M. incrustans (Johnst.), diagnosis, synonymy, and description, pp. 132- 
138, pi. iv, figg. 6, 7, pi. xiv, fig. 3, a-h; M. pedunculata, n. sp., from 
south of Jan Mayen, 262 fathoms, and between Iceland and the 
Faroes, 371 fathoms, pp. 148-160, pi. v, fig. 2, pi. xv, fig. 1, a-d ; M. 
perspinosa , n. sp., from Faskrudsfjord, Iceland, 20-50 fathoms, and 
Jan Mayen, 50-60 fathoms, pp. 147, 148, pi. v, fig. 1, pi. xiv, fig. 7, 
a-e; M. pluridentata , n. sp., from off Iceland, 20-44 fathoms, pp. 151— 
153, pi. v, fig. 4, pi. xv, fig. 3, a-e; M. rosacea (Liebk.), diagnosis, 
synonymy and description, includes Dendoryx incrustans , var. viscosa 
Topseut, pp. 138-140, pi. iv, fig. 8, pi. xiv, fig. 4, a-h: Lundbeck 
(17). — M. tenuissima , n. sp., doep water off' Gallo: Dendy (8) pp. 169, 
170, pi. xi, fig. 5.— M. variisdera , n. sp., Black Sea, pp. 30, 31 & 51, 52, 
pi. iv, fig. 10, pi. vi, fig. 2; M. veneta O. S., described, pp. 29, 30, 
pi. iv, fig. 9, pi. vi, fig. 1 : Svarchevskii (35). 
Myxillece for Dendorycince , diagnosis and characters : Lundbeck (17) 
pp. 125, 126. 
Oceanapia , see Phloeodictyina;. 
Ophlitaspongia mcmbranacea n. sp., Juan Fernandez: Thiele (36) pp. 450, 
451, figg. 67, a-e, 105. 
Pachychalina O. S., defined: Baer (1) p. 15: Dendy (8)p. 148: Dragne- 
witsch (9) p. 25 ; Svarchevskii (35) p. 23. — P. brevispiculifera, n. sp., 
Gulf of Manaar ; Dendy (8), p. 149, pi. x, fig. 7. — P. compressa O. S. 
a synonym of Homceodictya palmata (Johnst.), q. v. ; Lundbeck (17) 
p. 125. — P. delicatula Dendy: Dendy (8) p. 149. — P. fibrosa R. and D.* 
described : Dragnewitsch (9) p. 26. — /*. irregulans (Tscheru.), 
described: Svarchevskii (35) p. 23, pi. v, fig. 2; P . magellanica , 
n. sp., Straits of Magellan : Thieve (36) pp. 474, 475, figg. 13, 13a, 
