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PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES 
Series 4, Volume 65, 28 Sept. 2018, No. 3 
Table 2. Species included in Goddard et al. (2016) that were found in 2016-17 at or near, but not beyond, previously 
determined northern range limits. The relevant observation(s) can be found by searching by species the websites given in 
the right column. Initials in the right column refer to authors of the present study. 
Species 
Site(s) 
Source 
Navanax inermis (Cooper, 1863) 
Bodega Harbor, Tomales Bay, Drake’s 
Estero, CA 
iNaturalist 
Okenia rosacea (MacFarland, 1905) 
Cape Arago, OR 
iNaturalist 
Thordisa bimaculata Lance, 1966 
Monterey Peninsula 
Observations by BG on iNaturalist 
Felimare californiensis (Bergh, 1879) 
Anacapa & Santa Cruz Islands, CA 
“divindk” [D. Klug] on Flickr 
Felimida macfarlandi (Cockerell, 1901) 
Monterey, CA 
Observations by BG, RA, & others on 
iNaturalist 
Janolus anulatus Camacho-Garcla & Gosliner, 2006 
Tarpits Reef, Carpinteria, CA 
Observations by JG on iNaturalist 
Janolus barbarensis (Cooper, 1863) 
San Francisco Bay, CA 
iNaturalist 
Anteaeolidiella oliviae (MacFarland, 1966) 
Sonoma coast, CA 
iNaturalist 
Babakina festiva (Roller, 1972) 
Fitzgerald Marine Reserve, CA 
iNaturalist 
Cuthona phoenix Gosliner, 1981 
Monterey, CA 
Observations by RA on iNaturalist 
with 10 more species not included in Goddard et al. (2016). The remaining 10 species are listed in 
Table 2. 
Bulla gouldiana (Pilsbry, 1893). Elkhom Slough, 1 specimen, intertidal mud flats, 16 May 
2018 (Imkitayama 2018b). Morro Bay, California, intertidal muddy sand flats, May through mid- 
November 2017 (observed by JG; for image see <https://www.inaturalist.org/ 
observations/3127748>; Eaton 2016). On 13 November 2016 shells measured up to 50 mm long, 
and one yellow egg string was found (see <https://www.inaturalist.org/observations/6223507>). 
Bentall (2017) noted only large, empty shells at one site in Morro Bay in March 2017, but in 
November 2017 JG observed numerous large specimens and their egg strings (see 
<https://www. inaturalist. org/'observations/8818733>). 
Remarks: The published northern limit of B. gouldiana is Morro Bay (Roller and Long 1969; 
Behrens and Hermosillo 2005). However, Bulla gouldiana was also recorded as uncommon on 
Bodega tide flats in a list of marine invertebrates from Sonoma Co. compiled by Victor Chow in 
2013 (see <http://bml.ucdavis.edu/bmr/invert_list.PDF>). Additionally, Moss Landing Marine 
Laboratories (MLML) has in its Invertebrate Collection a preserved specimen (Catalogue No. 
MO600) collected from mudflats near the mouth of Elkhom Slough in Monterey Bay (see 
<http://digital.mlml.calstate.edu/islandora/object/islandora%3A15334>). No collection date is 
given, but the specimen was identified by John Cooper, who was a graduate student at MLML in 
the 1970s. This specimen presumably forms the basis for the inclusion of B. gouldiana in species 
lists for Elkhom Slough available in technical reports (e.g., DeVogelaere et al. 1998). 
At Naples, an open coast site on the south coast of Santa Barbara Co., B. gouldiana was absent 
from 2006 until late 2015, reached high adult densities by winter 2016, laid egg strings in May and 
June 2016, was absent by September 2016, and, in contrast to the population in Morro Bay, has not 
been observed again through mid-2018 (Fig. 4). 
Aplysia californica (Cooper, 1863). Yaquina Bay, Oregon, August 2016; one large specimen 
was found in a water storage reservoir, filled from Yaquina Bay, used by the Oregon Coast Aquar¬ 
ium (Pearsall 2016). 
