A HISTORY OF SUSSEX 



55. ScMzotheca fiisa, Busk. 



ZocEcia ovate, small, short ; aperture 

 elevated, with six spines and a narrow 

 sinus in the lower lip ; ocecium sub-cres- 

 centic or with a wedge-shaped fissure in 

 the middle. Upon an old scallop shell 

 from deep water ; rare. Hastings. 



56. Hippothoa divaricata, Lamouroux. 

 Colonies composed of oval zooecia arranged 



in single sequence and connected together 

 by tubular prolongations. Lateral branches 

 are given off at an open angle and unite 

 with others ; the aperture is circular but 

 with a narrow sinus below ; beneath the 

 aperture runs a thickened, longitudinal, 

 median ridge. Common upon shells and 

 stones from moderately deep water. Hast- 

 ings. 



57. Hippothoa fiagellum, Manzoni. 

 Similar in habit to the last species, but 



the zooecia are farther apart, the interval 

 being usually equal in length to two zooe- 

 cia, whereas in divaricata it is usually equal 

 to the length of one. The aperture is 

 egg-shaped, and there is no median ridge. 

 Common. Hastings. 



58. Rhyncopora bi-spinosa, Johnston. 



A species encrusting old shells, and one 

 subject to several modifications in the region 

 of the aperture, the margin of which is 

 sometimes produced into two lateral and 

 vertical processes ; at others, one of these 

 may be bent across the aperture, or may 

 become central. A fairly constant feature 

 is a more or less spinous mucro rising from 

 beneath the aperture. There is often too 

 a large avicularium mounted upon a broad 

 pedestal, taking the place of this mucro, 

 and generally placed rather laterally. One 

 specimen obtained is found enveloping a 

 colony of the hydroid Hydraciinia echinata, 

 itself encrusting the shell of a Nassa. The 

 ooecia upon this specimen are particularly 

 plentiful. Trawled ; rather rare. Hast- 

 ings. 



EsCHARID.*: 



59. Lepralia pollasiana, Moll. 



A hardy looking species encrusting rocks 

 at low tide. Aperture large, more deeply 

 arched than a semicircle ; front wall pit- 

 ted. Common. Hastings. 



60. Lepralia foltacea, Ellis and Solander. 

 This species forms large masses of foli- 

 ated and anastomosing laminae, the zooecia 

 being disposed on both sides of the lamina?. 



The zooecia are ovate, and have large pores 

 over the front wall. Aperture horse-shoe- 

 shaped, with sometimes a slight prominence 

 beneath. Habitat, rather deep water. 

 Somewhat scarce. Hastings. 



61. Lepralia pertusa, Esper. 

 Encrusting old shells. Zooecia oval, 



with a circular aperture, of which the 

 lower margin is slightly disjunct ; beneath 

 is a process, tri-radiate in form ; wall of 

 zooecium poriferous. It may be noted that 

 young zooecia of Smittia cheilostoma before 

 the development of the sinus closely re- 

 semble the zooecia of this species. From 

 moderately deep water; rather rare. Hast- 

 ings. 



62. Lepralia adpressa^ Busk. 



Colonies encrusting small shells, e.g. 

 whelk, Natica, Trochus. The zooecia are 

 ovate, pitted, and have a boss at either or 

 both corners of the aperture. The latter 

 is horseshoe shaped, the sides being slightly 

 indented ; from moderately deep water ; 

 somewhat rare. Hastings. 



63. Lepralia nitidula, Hincks, MS. 

 Hastings. 



64. Porella (oncinna, Busk. 



A species encrusting shells and stones 

 and showing much variation. The zooecia 

 are coffin-shaped, or various in form, and 

 has an opalescent lustre. The margin is 

 often deeply sinuous, almost dove-tailed, 

 and is perforated along the border. Aper- 

 ture horseshoe shaped, with two spines in 

 marginal zooecia and a prominence below. 

 Very common. From moderate to deep 

 water. Hastings. 



65. Smittia lanasborovii, Johnston. 

 Zooecia crystalline, oblong or coffin- 

 shaped, with perforations in the front wall. 

 Aperture nearly round and raised into a 

 collar, with a small avicularium upon the 

 lower lip. Not uncommon upon rock 

 from deep water. Hastings. 



66. Smittia reticulata, McGillivray. 



In this species there is a deep sinus in 

 the lower lip, and instead of an avicularium 

 there, as in the last species, there is a larger 

 one below, pointing downwards and look- 

 ing like a pendant from a neck. Above 

 the aperture there are either two or three 

 spines, and the margin of the zooecia is 

 bordered with pits or vacancies. Hincks 

 remarks upon an instance where two zooe- 

 cia side by side have a single wide ooecium 



